Keywords: Chamber position; Japanese red pine; Q10; Stem respiration rate; Stem temperature; Time lag 相似文献
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辽南地貌特征以低山丘陵为主,宜林山地较多,丰富的山地资源中,适宜栽植大扁杏生态经济林的地段颇多。根据适地适树和良种壮苗的原则,结合辽南特有的生态条件和大扁杏自身的生物学特性对优良品种进行确定研究。为大扁杏在辽南的可持续发展提供技术支持,并改善辽南山区生态环境,促进生态、社会、经济和谐发展。 相似文献
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指出了辽南地区作为海陆交互地带,存在多处湖沼相沉积区,湖相沉积是具备连续性好、保存完整的气候敏感度指标,以瓦房店红沿河剖面为对象,通过野外调查采样与室内相关实验相结合,主要分析了其粒度特征。结果表明:剖面整体沉积环境相对稳定,呈正偏态,主要以粉砂和极细砂为主。 相似文献
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本文采用相对变率关联分析法,对滨海地区杨树的树高、直径、单株木材积和材积生长量与主要的土壤化学因子:HCO_3~-,Cl~-,SO_4~(2-),Ca~(2+),Mg~(2+),Na~++K~+,阴离子总量、全盐量及pH值,进行了关联分析。结果表明,影响滨海地区杨树生长的主要土壤化学因子是土壤pH值,其次为HCO_3~-离子,再次为Ca~(2+)离子,从而为改良滨海土壤及提高造林质量,提供了理论依据。 相似文献
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寿光滨海平原白榆耐碱力的研究 总被引:2,自引:0,他引:2
山东滨海盐碱地,经人工脱盐改造,土壤全盐量大幅度下降,但一些地区土壤碱化已成为植物生长的限制因子。本文探讨了滨海碱化土壤形成原因、分布规律、对林木的危害情况;通过调查计算,提出白榆在土壤碱化度达到13%还能正常生长,在2O.1%时生长较差,达到25%时生长极差,甚至不能成活。 相似文献
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中国滨海湿地及其生态系统服务功能研究概述 总被引:4,自引:0,他引:4
滨海湿地是海陆交界的生态过渡带,具有特殊的水文、植被、土壤特征。滨海湿地在我国滨海的9个省、2个直辖市、2个特别行政区均有分布。第二次全国湿地资源调查结果显示,全国滨海湿地面积579.59万hm2,占全国湿地面积的12.42%。由于人为开垦与改造、污染物排放、泥沙淤积和水资源不合理利用等原因,中国滨海湿地生态系统服务功能面临诸多挑战。文章从滨海湿地的科学定义及分类入手,分析了现有滨海湿地生态系统服务功能评价方法。从静态评价和动态评价2方面分别阐述了滨海湿地生态系统服务功能的价值评估。针对现有滨海湿地生态系统服务功能研究中存在的问题,提出了今后应从构建滨海湿地生态系统服务功能评估体系、滨海湿地生态特征与生态系统服务功能内在机制研究、滨海湿地生态系统服务功能评估重复性计算、制图与管理等方面进行研究。 相似文献
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以黄条金刚竹(Sasaella masamuneana f. aureostriata)、铺地竹(Pleioblastus argenteostriatus)为试材,将2种中性盐NaCl、Na2SO4和2种碱性盐 NaHCO3、Na2CO3按不同比例混和,模拟出盐碱度各不相同的盐碱条件,研究不同盐碱胁迫处理对2种地被竹叶绿素含量的影响,旨在为今后优良耐盐地被竹选择及有效应用提供参考。结果表明,低浓度中性盐胁迫下,黄条金刚竹叶绿素a含量呈现“升高—降低—升高”的趋势,其余处理叶绿素a含量变化较为平缓,说明植株始终受到抑制;铺地竹受到胁迫后,叶绿素a在胁迫初期均呈现上升趋势,但随着胁迫时间的推移,叶绿素a含量呈现明显的下降趋势,尤其以盐浓度300 mmol/L处理最为明显。2种竹叶绿素b含量变化基本呈现初期上升后期下降的趋势。碱性盐胁迫下,2种竹的叶绿素a和b含量变化规律不明显,但是含量总体呈现下降的趋势。 相似文献
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白藤是中国热带、南亚热带森林中重要的伴生藤本和非木质森林资源。为探究白藤种子萌发的最佳处理,采用赤霉素(GA3)浸种对白藤种子发芽特性进行研究。结果表明:发芽率以50 mg/L的GA3溶液浸种处理最高(91.82%),该处理能提高白藤种子发芽率;发芽势和发芽指数均以400 mg/L GA3溶液浸种处理最高(83.18%,16.67),20 mg/L GA3溶液浸种处理最低(50.65%,11.50)。建议采用GA3溶液浸种与催芽技术相结合,以提高白藤种子发芽率、发芽势和发芽指数。 相似文献
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The duration of P fertiliser in acid forest soil was investigated in a Norway spruce (Picea abies Karst.) forest in south-central Sweden. The fertilisation of the soil started in 1967, but no P has been applied since 1988. The N fertilisation is still continuing. Totally, 300 kg P per hectare, as superphosphate, and/or 1090 kg N per hectare, as ammonium nitrate, was applied. Concentrations of both 0.05M Na2SO4 + 0.02M NaF extractable P and 0.5M H2SO4 extractable P in the Of, Oh, E and top B horizons of fertilised soils were elevated compared to the control. The P fractions considered to be extracted are adsorbed and some Al-bound phosphate, in the case of Na2SO4 + NaF, and Ca phosphates, in the case of H2SO4. 3–4% of the added P was recovered as Na2SO4 + NaF extractable P, and 10–22% was recovered as H2SO4 extractable P in the soil profile down through the first 5 cm of the B horizon. Still continuing ammonium nitrate fertilisation has decreased the H2SO4 extractable P concentration in this soil. Cumulative P fertiliser application of 300 kg P per hectare has counteracted this decrease. 相似文献
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以尾巨桉(DH32-29)幼苗为试验材料,以植株的生长指标(苗高、地径、叶面积)、生物量、根冠比、氮平衡指数(NBI)、叶绿素相对含量(SPAD 值)、丙二醛(MDA)含量和叶绿素荧光参数为指标,通过盆栽试验设置8个10~140 mg·kg-1浓度镉(Cd)盐溶液处理,研究了不同浓度 Cd 胁迫处理下尾巨桉幼苗的形态和生理特性变化规律。结果显示:低浓度(10 mg·kg-1)Cd 处理对尾巨桉幼苗的形态和生理特性无明显影响。当 Cd 浓度大于20 mg·kg-1,随着 Cd浓度的逐渐增大,其对尾巨桉幼苗的伤害程度也逐渐增加,主要表现为:植株生长缓慢、生物量减小、叶绿素相对含量和叶绿素荧光参数(Fv/Fm、φPSⅡ、NP、NBI)均下降,qP 无明显变化, MDA 含量升高。Cd 浓度大于60 mg·kg-1以上时,尾巨桉幼苗生长出现一定程度上的损伤症状和生长停滞现象。结果表明低浓度(≤20 mg·kg-1)Cd处理下尾巨桉幼苗能正常生长,随着浓度的增大,Cd 处理对尾巨桉的形态和生理特性造成显著影响。同时结合部分桉树适生区土壤 Cd 含量调查及相关研究结果认为,尾巨桉具有一定修复 Cd 污染区土壤的潜力。 相似文献
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Effects of flow rate and chamber position on measurement of stem respiration rate with an open flow system in a Japanese red pine 总被引:2,自引:0,他引:2
The effects of air flow rate and chamber position on measuring stem respiration rate (Rstem) were examined using an open flow system on six Japanese red pine (Pinus densiflora Sieb. and Zucc) trees. Rstem was more closely correlated with stem temperature observed 2–6 h earlier than with current stem temperature. Rstem was not affected by the air flow rate passing through the stem chamber. Although there were no differences in stem temperatures between azimuth angles, there were significant differences in Rstem between azimuth angles (except for only one case) of each sample stem. The distance from below the bark to the stem centre varied at each azimuth in the samples, and was significantly positively correlated with R0 (p < 0.01). The chamber type did not affect the measurement of stem respiration, because the mean Rstem of four azimuth angles measured with in a rectangular chamber was almost the same as Rstem measured with in a circular chamber. From these results, we suggest that a whole circumference estimate made by either:
- (1) measuring stem respiration at each azimuth separately with a rectangular chamber, or
(2) measuring the total CO2 efflux from the whole radial circumference with a circular chamber,
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Xianai Huang Duygu Kocaefe Yasar Kocaefe Yaman Boluk Andre Pichette 《Wood Science and Technology》2012,46(6):1215-1237
Effect of artificial weathering on the wettability of three heat-treated North American wood species (jack pine, aspen, and birch) is studied from the point of view of the structural and chemical changes taking place on the wood surface. Weathering increases wettability of all three heat-treated woods by water. Changes in wettability during artificial weathering differ according to heat treatment procedure and wood species and are likely due to combination of structural and chemical changes of the surfaces. Scanning electron microscopic analysis indicates that cracks form due to degradation taking place during weathering. As a result, water has easier entry into the cell wall, which consequently increases wettability. IR spectra suggest that the OH/CH2 ratio for heat-treated specimens is inversely proportional to the contact angle regardless of the type of wood species. The presence of cellulose-rich layer on wood surface and increasing amount of amorphous cellulose transformed from crystallized cellulose due to weathering result in increase in hydroxyl; consequently, it increases heat-treated wood wettability. 相似文献
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生物土壤结皮是由土壤微生物、藻类、地衣和苔藓植物等孢子植物类群与土壤形成的有机复合体,具有极强的生态适应性,广泛分布于陆地生态系统中。对于生物土壤结皮的研究过去主要集中在干旱荒漠地区的生态修复方面,近年来研究发现,生物土壤结皮可以有效固定CO2等温室气体,实现生态环境的良性循环。研究生物土壤结皮形成、发育过程的特点,合理推广利用生物土壤结皮,可以改善生态环境、提高固定CO2效率和降低温室效应。文中综述了生物土壤结皮国内外相关研究最新进展,总结了生物土壤结皮的种类和对生态的积极作用,分析其对减缓温室效应的作用机理,并对未来研究重点进行展望,以加深对生物土壤结皮的认识,促进其在环境修复方面的推广应用。 相似文献