实生苹果树落叶前叶片矿质营养状况及相互关系的研究

研究了苹果杂种实生树营养元素含量及其相互间的关系。结果表明,在栽培条件一致、树体生长发育正常的情况下,不同品系苹果树同一种营养元素含量差异很大,其中氮、磷、钾、钙、镁、铁、锌、锰、硼的含量范围分别为1．576～2．194％、0．070～0．215％、0．51～1．78％、0．52～2．97％、0．24～0．63％、0．014～0．058％、0．001～0．016％、0．007～0．052％、15．2～36．9mg／kg;养分离子被苹果树体吸收时,氮和铁、锰、硼离子间,磷和镁、锌、锰离子间,钾和钙、镁、铁、锌离子间,锌和锰、硼离子间有拮抗作用,氮和磷、钾、钙、镁、锌离子间,磷和钾、钙、硼离子间,钾和锰、硼离子间,钙和镁、铁、锌、锰、硼离子间,镁和铁、锌、锰、硼离子间,铁和锌、锰、硼离子间,锌和锰、硼离子间,锰和硼离子间有协助作用。     

南方酸性土壤交换性钙、镁和钾测定方法的探讨

本文通过南方酸性土壤交换性钙、镁、钾和速效钾不同提取方法和不同振荡时间的测定结果的比较分析,得出同一处理液（即：5克土样加50ml1N乙酸铵振荡5 min）可同时测定交换性钙、镁、钾和速效钾.此方法与GB7865-87, GB7856-87 ,GB7856-87测定结果无显著差异,却更加简单、快速、准确,分析成本大大降低,是一个值得推广普及的方法.     

祁连山青海云杉林土壤代换性钾、钙、镁含量及其分布规律研究

以祁连山大野口流域100m×100m青海云杉林样地为试验地,采用野外土壤剖面分层取样法测定和分析了青海云杉林地土壤代换性钾、钙、镁含量及其在剖面上的变化规律。结果表明:试验地青海云杉林土层(0~10cm)代换性钾、钙、镁含量平均值分别为190.6、166.9和55.8mg·kg~(-1);土壤代换性钾和钙在土壤剖面中具有向土壤表层富集的趋势,而土壤代换性镁在土壤剖面中具有向土壤下层移动富集的趋势;土壤代换性钾、钙与土壤有机质相关性呈极显著正相关(P0.01),土壤代换性镁与土壤有机质相关性不显著(P0.05)。     

修枝对滩地杨树生长和养分的短期影响

以怀宁县皖河滩地杨树林为研究对象,对修枝前后林木与土壤中的养分含量进行了研究。结果表明：（1）一定修枝强度下,修枝对杨树的树高和胸径生长影响显著（P〈0．05）,但随着修枝强度增大对树高生长的影响是先增大后减小,而对胸径的影响是一直增大。（2）修枝会降低林地土壤全氮含量,但对土壤全氮、全磷、速效磷和钾含量影响不显著（P〉0．05）。（3）修枝对不同土层深度土壤养分影响不显著（P〉0．05）,但全氮、全磷、速效磷含量均随着土层深度的加深而逐渐减少,钾、钙、镁含量基本相同;同一修枝强度下,各种养分含量在不同方向基本持平,只有钙的含量在每个方向都是以轻度修枝最大。（4）植物各器官中,全氮含量以根最高,3种修枝强度下,随着年龄增大枝的全氮含量降低,根的全氮含量增加。同时,修枝对上部枝的全氮含量影响显著（P〈0．05）;修枝强度对中部枝和大于5mm根的全氮含量影响显著（P〈0．05）;修枝对植物各组分全磷含量影响不显著（P＞0．05）;除中部枝的钙含量在轻度修剪与强度修剪有显著差异外（P〈0．05）,修枝对植物钾、钙、镁的影响不显著（P〉0．05）,但随着枝的生长钾、钙、镁的含量有降低的趋势;随着根的生长,钾、钙、镁的含量变化规律不明显。     

内蒙古几个沙地土壤理化性状调查研究

本文对内蒙古科尔沁沙地、浑善达克沙地和库布齐沙漠土壤理化性质进行了调查研究。结果表明：在土壤0～60cm土层范围内,库布齐沙漠土壤容重平均为1．45g／cm^3,科尔沁沙地为1．50g／cm^3。科尔沁沙地各类土壤平均养分含量分别为：全氮0．042％,全磷0．018％,全钾2．706％,速效磷3．274mg／kg,速效钾35．190mg／kg,有机质9．095g／kg,pH值7．5;在库布齐沙漠：全氮0．014％,全磷0．035％,全钾1．808％,速效磷1．353mg／kg,速效钾67．360mg／kg,有机质平均含量为6．216g／kg,pH值为9;在浑善达克沙地：速效磷4．032mg／kg,速效钾67．247mg／kg,有机质含量为7．450g／kg,pH值为7．5。土壤微生物在沙地土壤养分循环过程中具有重要的作用,土壤真菌、放线菌、细菌平均数量在库布齐沙漠分别为：2．4×10^3个／g（土）、1．8×10^5个／g（土）和1．8×10^6个/g（土）;科尔沁沙地分别为：6．6×10^4个／g（土）、3．8×10^5个／g（土）、1．3×10^6个／g（土）。在土壤微生物群落结构中,细菌大约占73．5％-91．9％,放线菌约占7．8％-22．5％,真菌数量最小。土壤有机质含量是影响微生物数量的主要因子,二者间具有良好的线性相关关系。     

新型畜禽饲料添加剂——海带粉

保健麦即紫（紫红或紫黑）小麦，蓝小麦，绿小麦是应用化学诱变，物理诱变和远缘杂交三结合育种方法，经太空升级，在微重力等综合作用下形成有益基因变异后，在地球上培育而成的高科技小麦新资源品种。保健麦富含微量元素铁、锌、锰、铜、硒和常量元素锰、钠、镁、钾、磷、钙；富含18种氨基酸，其总和含量为10．9％，比普通小麦高91．5％，其中含谷氨酸3．28％，蛋氨酸、脯氨酸、天冬氨酸、赖氨酸、异亮氨酸等人体必需氨基酸分别高于普通小麦51．1％、41．9％、17．0％、9．9％和4．9％。     

三峡库区水位消落植被土壤pH、阳离子含量随海拔及年际的动态特征

目的 分析三峡水库运行10年间（2008—2018年）,消落带不同海拔区段（145～155 m、155～165 m、165～175 m）土壤pH值和金属元素含量变化特征,为消落带分区段监测治理及库区土壤环境质量演变预测提供科学依据。 方法 根据三峡水库运行调度特征,在秭归县典型消落带区域内选择3块生境类型相似的次生灌丛样地,测定2008、2009、2012、2014、2015、2016、2018年不同海拔区段表层（0～20 cm）土壤的pH值和金属元素含量,分析其在不同海拔区段和年际间的差异及变化。 结果 （1）随着水库水位的周期性涨落,2008—2018年间消落带区域土壤pH值、金属元素钾、钙、镁含量的年际变化均呈现出波动式增加的趋势,铁、锰、锌含量呈现波动式下降的趋势,钠含量则呈现逐年下降的趋势。（2）在各年份的不同海拔高程间,土壤pH值和钾含量呈现145～155 m > 155～165 m > 165～175 m海拔的特征,铁、锰含量呈现出145～155 m < 155～165 m < 165～175 m海拔的特征,钙含量在145～155 m海拔区段富集,钠、镁、锌含量则无明显的海拔分布差异。至2018年,145～155 m和155～165 m海拔区段土壤已由酸性发展为碱性,165～175 m区段由酸性发展为中性。（3）相关性分析和回归分析发现：土壤pH值与金属元素含量有密切相关性。其中,土壤pH值与钾、钙、镁含量之间存在显著正相关（p < 0.01）,与锰、锌、钠（p < 0.01）和铁（p < 0.05）含量之间存在显著负相关。 结论 经历10次水位涨落期间,消落带不同海拔区段土壤pH值和金属元素含量均发生了不同程度的改变,表明周期性水淹是影响消落带土壤性质的主要因素,海拔和土壤pH值是影响土壤金属元素含量的重要因素,这将为三峡库区消落带不同海拔区段土壤质量的演变趋势预测提供重要的基础依据。     

渭北黄土坮塬区苹果园土壤养分状况分析

采用常规方法测定了渭北黄土坮塬区110个苹果园的土壤养分含量,结果表明苹果园0～30 cm土层土壤有机质含量8.9～12.1 mg·kg-1,平均为10.05 mg·kg-1,属较低水平;有效氮、磷、钾供应状况大约为钾＞氮＞磷,按照农田土壤养分丰缺指标衡量,果园土壤普遍缺磷,约40％土壤缺氮,而钾素含量较为丰富;有效铁、锌、锰含量大部分在边缘值以下,其比例分别为铁64.5％、锌83.4％、锰91.3％,缺乏程度依次为Mn＞Zn＞Fe,远远不能满足苹果优质、高产之需要.     

集约经营雷竹林对土壤水溶性盐基组分含量的影响

2016年6月,以水稻田和红豆杉幼林地为对照,在浙江省临安市选取2、6、8、11、16、20 a集约经营雷竹林(Phyllostachys praecox cv.prevernalis)提取0~10 cm、10~20 cm和20~40 cm层土样,测定各层钠、钙、镁、钾4种水溶性盐基离子浓度。结果表明,随着竹林覆盖经营时间的延长,土壤水溶性钾随着土层深度的增加而下降,水溶性钠和钙随土壤深度的增加而上升,水溶性镁在各土层的分布变化不大;对比水稻田土壤和红豆杉幼林地土壤,雷竹林表层土壤(0~10 cm)中水溶性钾、钙、钠和镁含量随着集约栽培时间增加,土壤水溶性盐基组分含量呈单峰型变化,其含量与雷竹的集约栽培措施密切相关。     

附地菜有效成分分析

采用原子吸收分光光度计对附地菜中的有效元素进行测定，测定结果显示，含有丰富的钙、镁、锰、锌、铜、钠、钾等元素。     

孟加拉哈提亚地区海岸造林对土壤性质的影响

在孟加拉诺阿卡利地区及相临裸地,对海岸植被(12年和17年生无瓣海桑Sonneratia apetala)进行探索性研究,以便了解海岸造林对土壤特性的影响.在三种不同地带(内陆、中部、海边),在12年生和17年生无瓣海桑林下,土壤深度分别为0-10,10-30和30-40cm,土壤湿度、土壤粒度、有机质、C含量、总N、pH、有效P、K、Na、Ca和Mg含量明显高(p≤0.05,p≤0.01,p≤0.001)于其相临裸地的数据,土壤含盐量明显(p≤0.01)低于其相临裸地的数据.在内陆CharAlim植被,土壤表面的土壤湿度,土壤粒度,有机质,C含量、总N、pH、土壤含盐量、有效P、K、Na、Ca和Mg含量分别为:31.09%、2.24 g·cm-3、2.41%、4.14%、0.58%、7.07、O.09 dS·cm-1、28.06 mg·L-1、O.50 mg·L-1、11.5 mg·L-1、3.30 mg·L-1和2.7 mmol·kg-1;而在相邻的Char Rehania贫瘠地区的相同土壤深度,其相关值分别为:16.69%、1.25g·cm-3、O.43%、0.74%、O.25%、6.57、0.13 dS·cm-1、13.07mg·L-1、O.30mg·L-1、1.4 mg·L-1、O.30 mmol·kG-1和0.50 nag·L-1.然而,在小内陆到海边的植被中,土壤湿度、土壤密度、有机质、C含量、总N、pH、有效P、K、Na和Ca含量逐渐降低,而土壤含盐量、Na和Mg含量却逐渐增加.虽然,在植被与相临裸地的不同土壤深度中土壤质地不同,植被地中砂土份额明显(p≤0.01)低于相临裸地,而粉砂土份额则明显(p≤0.001)高于裸地.在本研究中,所有参数的评价也在为其他地区相关研究得到应用.     

Mineral nutrient fluxes in rainfall and throughfall in a lowland Atlantic rainforest in southern Brazil

The ecosystems occurring on dystrophic soils, such as sandy soils, are highly dependent on nutrients from the atmosphere and those cycled by their own biota. Nutrient inputs from rainfall and throughfall were measured between October 2001 and August 2003 in a secondary Atlantic rainforest in southern Brazil. Canopy interception (rainfall minus throughfall) was 17.3% of the annual rainfall of 2,235 mm. Monthly interception ranged from 12 to 31% during the rainiest months (precipitation above 200 mm) and from 1 to 45% during the driest months (precipitation below 50 mm) indicating relatively high variability during this period. The studied site may be susceptible to water stress in this period due to the high permeability of the sandy soil. Approximately 80% of the Ca and Na and 57% of Mg were mainly from rainfall (bulk deposition) whereas the main input source for K was net throughfall (about 78%). Mean annual inputs via throughfall (in kg ha⁻¹) were: 90.6 for Na, 29.1 for K, 7.1 for Ca, and 2.9 for Mg. The highest nutrient inputs occurred during the rainy season. Na fluxes were relatively high, while K, Ca, and Mg inputs were low, compared with other tropical and subtropical forests. Information on nutrient fluxes for different forest ecosystems are fundamental for building up a database that can give support to environmental diagnosis, to forest management, and to conservation and restoration techniques.     

Interception loss, throughfall and stemflow chemistry in pine and oak forests in northeastern Mexico

Interception loss, gross precipitation, throughfall and stemflow solution chemistry beneath pine (Pinus pseudostrobus Lindl.), oak (Quercus sp.) and pine-oak natural forest canopies in northeastern Mexico were measured. Coefficients of variation for throughfall were 12% in pine and oak canopies and 17% in the mixed pine-oak canopy. The variability of stemflow averaged 66, 126 and 73% for pine, oak and the mixed pine-oak canopies, respectively. Linear regression analysis of net versus gross precipitation for the three canopies showed highly significant correlations (r = 0.974-0.984). Total precipitation during the experimental period was 974 mm and estimated interception loss was 19.2, 13.6 and 23% for the pine, oak and pine-oak canopies, respectively. Stemflow did not occur following rainfall events of less than 4 mm and, in all canopies, stemflow represented a minimal proportion of gross precipitation (0.60, 0.50 and 0.03% for pine, oak and pine-oak, respectively). Throughfall pH in pine (6.2), oak (6.3) and pine-oak (6.3) canopies was significantly more acidic than gross precipitation (6.6). Stemflow pH ranged from 3.7 (pine) to 6.0 (oak). The pine-oak canopy registered the highest throughfall and stemflow electrical conductivities, 104 and 188 microS cm(-1), respectively. Net nutrient leaching of K, Mg, Na, Fe, Mn and Zn was significantly higher from the pine-oak canopy than from the pure pine and oak canopies. Mean depositions of Ca and Cu in throughfall behaved similarly among the three types of canopies. A greater proportion of Zn in gross precipitation was absorbed by the oak canopy than by the pine and pine-oak canopies. Enrichment factors beneath the pine-oak canopy relative to gross precipitation varied from 1.2 to 3.2 for macro-nutrients (Ca, K, Mg and Na) and from 1.4 to 3.1 for micro-nutrients (Cu, Fe, Mn and Zn). Stemflow depositions of Ca, K, Mg and Cu were higher in the pine-oak canopy, whereas stemflow depositions of Na, Fe, Mn and Zn were higher in the pine canopy.     

Effects of Ca^2＋concentrations on accumulations of mineral elements in the components of Pteroceltis tatarinowii

The bark ofPteroceltis tatarinowii is a raw material for manufacturing Xuan Paper. The effects of Ca²⁺ concentrations on the accumulation of mineral elements in the bark, leaf and root ofPteroceltis tatarinowii were studied under controlled conditions. The types of Hoagland nutrient solution with three Ca²⁺ concentrations levels (200, 400 and 600 μg·g⁻¹) and a control (without Ca²⁺ were designed to culturePteroceltis tatarinowii. After 6 months, contents of seven mineral elements including Ca, K, Mg, Mn, Zn, Cu and Na in the root, leaf and bark were analyzed. The results indicated that Ca accumulations content in the root, leaf and bark had positively relation with Ca²⁺ concentrations (200, 400, 600 μg·g⁻¹), and the order of the Ca content in the three components was root>leaf>bark. Ca content in the root treated with 600 μg·g⁻¹ Ca²⁺ concentrations was 5.5 times as high as that of the control, and about 1.4 times as high as that of the root treated in 200 and 400 μg/g Ca²⁺ concentrations respectively. On the contrary, K and Mg contents in the root, leaf and bark were negatively related to Ca²⁺ concentrations, especially in the bark, and their accumulation trend followed the order of leaf>root>bark. K content in the bark treated with 600 μg·g⁻¹ Ca²⁺ concentrations was 39.3% of that of the control, and was 79.0% and 91.8% of that of the bark treated with 200μg·g⁻¹ and 400μg·g⁻¹ Ca²⁺ concentrations respectively; Mg content in the bark treated with 600μg·g⁻¹ Ca²⁺ concentrations was 23.4% of that of the control, and was 27.1% and 35.4% of that of the bark treated with 200 and 400 μg·g⁻¹ Ca²⁺ concentrations respectively. Compared with the control, the general tendency of Mn, Zn and Cu content decreased with increasing of Ca²⁺ concentrations and their contents were in the order: root>leaf>bark. Based on the results of this study, the experiment has been useful for providing academic bases in improving the bark quality ofPteroceltis tatarinowii on non-limestone soil. Foundation item: This paper is supported by National Natural Science Foundation of China (No. 39970608). Biography: Fang Shengzun (1963), male, Professor in Stiiviculture, Nanjing Forestry University, Nanjing 210027, P.R. China. Responsible editor: Zhu Hong     

Nutrient concentrations in roots, leaves and wood of seedling and mature sugar maple and American beech at two contrasting sites

Differences in sensitivity to soil conditions across tree species and developmental stage are important to predicting forest response to environmental change. This study was conducted to compare elemental concentrations in leaves, stems, and roots of (1) sugar maple (Acer saccharum Marsh.) seedlings vs. mature trees and (2) mature sugar maple vs. mature American beech (Fagus grandifolia Ehrh.) in two sites that differ in soil base saturation and pH. Both sites are located in Huntington Forest, NY, USA; one site (hereafter ‘H’) has higher soil pH and Ca, Mg, and Mn concentrations than the other site (hereafter ‘L’). Sugar maple growth at H (14.8 cm² year⁻¹ per tree) was much greater than at L (8.6 cm² year⁻¹ per tree), but the growth of beech was not different between the two sites. Leaves, roots, and stem wood of mature beech trees and sugar maple seedlings and mature trees were sampled for nutrient analysis. Foliar Ca, K, and Al concentrations were positively correlated with soil elements, but Mn concentrations were negatively correlated. Sugar maple differed more than beech between sites in foliar K and Mn concentrations. Root Mg and P concentrations reflected soil chemistry differences, in contrast to foliar concentrations of Mg and P, which were indistinguishable between the sites. In sugar maple, seedlings differed more than in mature trees in nutrient concentrations in roots, especially for Mg and Mn. Although beech was not as responsive to nutrient availability as sugar maple in foliar and root nutrient concentrations, Ca and Mg concentrations in beech wood were higher in H (52% higher for Ca and 68% higher for Mg), while sugar maple did not differ between sites. Sugar maple regeneration failure on acidic soils in the same region is consistent with our finding that sugar maple seedlings were very sensitive to nutrient availability. This sensitivity could ultimately contribute to the replacement of sugar maple by American beech in regions of low pH and base cations if base cation leaching by anthropogenic deposition and tree harvesting continues.     

云南河口橡胶园土壤养分分析

2006年底通过对河口橡胶产业分公司各作业区橡胶林地土壤进行养分测定,结果表明:有70%的土壤缺磷,79%的土壤缺镁,60%的土壤缺锌;钾、锰、硫的含量处于中等水平,但也有近30%以上的土样低于临界指标;而钙、铜、铁的含量较丰富;有机质和碱解氮的含量水平也较高,平均值分别为2.86%和122.58mg/kg,都高于临界指标,只有少量缺乏;有部分土样呈现出富钾缺镁的状况。根据分析结果提出相应的施肥建议。     

亚热带林7种林冠树种落叶分解中矿质元素动态

应用分解网袋法对亚热带常绿阔叶林7种常见林冠树种落叶分解过程中矿质元素(K,Na,Ca,Mg,Al,Fe,Mn,Cu和Zn)动态变化进行了为期2年的研究。这些树种是研究地区森林植被的代表种,且不同树种的落叶化学组成差异明显。研究结果表明:落叶分解速率(落叶干重残留百分率和分解常数k)与矿质元素初始浓度之间没有明显的相关性。但是,大多数情况下,落叶干重残留百分率与残留落叶的矿质元素浓度之间有着显著的相关关系。落叶分解过程中不同矿质元素的迁移性大小依次为:Na=K>Mg≥Ca>N≥Mn≥Zn≥P>Cu>>Al>>Fe。各树种的K和Na浓度在分解中均表现为下降趋势,Ca和Mg浓度亦表现为下降趋势,但在分解初期偶有升高倾向。而各树种中的其它元素(Zn,Cu,Al,Fe)浓度在分解中都表现出升高趋势,唯有Mn例外,在不同树种间,其浓度的变化模式存在一定差异。大多数树种的Cu,Al和Fe等3元素在分解试验末期的绝对重量均比初始重量显著提高,其机理在很大程度上可能归因于这些元素与腐殖质的结合,而不是生物固定。     

Soil-solution chemistry in black locust, pine/mixed-hardwoods and oak/hickory forest stands in the southern Appalachians, U.S.A.

Soil-solution chemistry was measured over a 15-month period in three forest stands of contrasting nitrogen mineralization and nitrification rates in the southern Appalachians of North Carolina, U.S.A., using porous-cup lysimeters. In a black-locust-dominated stand, soil solution NO₃---N was 3.73 and 5.04 mg l⁻¹ at 30- and 60-cm depth respectively, and dissolved organic N ( ) was 0.718 and 0.582 mg l⁻¹ respectively. Values at 30 and 60 cm for a pine/mixed-hardwood stand were 0.032 and 0.058 mg l⁻¹ NO₃---N, and 0.201 and 0.168 mg l⁻¹ (values are means over the whole duration of the study). At both depths, soil solution conductivity, pH, Ca, Mg, K and PO₄---P were higher in black locust than in pine/mixed-hardwoods, and there were no differences in soil solution Na. In an oak/hickory stand, soil solution NO₃---N at 30-cm depth was 0.008 mg l⁻¹, and was 0.357 mg l⁻¹. At 30-cm depth, soil-solution conductivity, Ca, Mg and PO₄---P were higher in black locust than in oak-hickory, with no differences in pH, K and Na; , pH and K were higher in oak/hickory than in pine/mixed-hardwoods. In the oak/hickory and pine/mixed-hardwoods forest stands, with relatively lower soil N turnover rates, was a major portion of soil solution N.     

Long-term forest management after wildfire(Catalonia,NE Iberian Peninsula)

Studies of post-fire soil status in Mediterranean ecosystems are common;however,few have examined the effects of long-term forest management after a wildfire on physicochemical soil properties.Here,we analyzed differences in soil properties attributable to long-term postfire management and assessed the sustainability of these management practices in relation to the soil properties.The study area is located in Odena in the northeast region of the Iberian Peninsula consisted of the control forest(burned more than 30 years ago),low density forest(LD;burned in a wildfire in 1986 and managed in 2005)and high density forest(HD;burned in a wildfire in 1986 and no managed).For soils from each plot,we measured soil water repellency,aggregate stability,total nitrogen(TN),soil organic matter(SOM),inorganic carbon(IC),pH,electrical conductivity,extractable calcium,magnesium,sodium,potassium(K),phosphorus,aluminum(Al),manganese(Mn),iron(Fe),zinc,copper,boron,chrome,silicon and sulfur and calculated the ratios of C/N,Ca+Mg/(Na+K)^1/2,Ca/Al and Ca/Mg.Significant differences were found in TN,IC,SOM,pH,K,Al,Mn,Fe and C/N ratio(p<0.05).All soil properties were found to have largely recovered their pre-fire values.Soils were affected by the post-fire management practices implemented 20 years after the fire,as reflected in their respective physicochemical properties,so that soil properties at the control and LD sites are more similar today than those at the control and HD sites.Thus,sustainable forest management can overcome soil degradation in areas affected by wildfire in the medium-and long-term by improving soil properties.     

寒温带兴安落叶松林生态系统养分特征

森林生态系统营养元素的积累和循环是维护森林生态系统健康稳定的关键因素之一,对森林生态系统的存在和发育具有重要的意义。文章对寒温带兴安落叶松林生态系统的养分输入、贮藏和输出特征进行了初步的研究。结果表明:林冠对Ca、Mg、Fe总体呈现吸附趋势,其中对Ca元素的吸收最为显著;P、K元素则是经林冠后含量增加;微量元素Mn的输入主要来自降雨,林冠对其的利用很少;各元素在植物和土壤中贮存的比例存在较大的差异,其中Ca、Mg、Mn主要贮存于植物体中,其贮存量约占86.06%、84.25%和94.18%;植物体中P、K的贮存量约占总贮量的44.62%和58.82%;Fe主要贮存于土壤当中,植物体中Fe的贮存量仅占总贮存量的9.16%;在兴安落叶松林生态系统中径流输出是养分元素主要的输出途径,其中P、K、Mn元素的年输入量大于输出量,生态系统中养分含量呈累积增加趋势,而Ca、Mg、Fe元素的输出量大于输入量,表现为养分流失,其中Ca的损失量最大。