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1 土地要求1-1 质地要求土壤含盐量在0-3%以下,地下水位在1m以下,灌溉方便的沙壤土或壤土地,种植前每公顷施45~75t厩肥,深翻,作为基肥。1-2 栽前准备为适应北疆地区种植枣树矮、密、早,冬季易于培土防寒的需要,种植密度以每公顷3330~6660株为宜,即株行距为1~1-5m×1-5~2-0m,嫁接部位低的可平畦栽植(充分利用肥沃表土),嫁接部位高的开沟栽植(以便培土越冬)。所挖树坑大小为50cm×50cm,表土和底土分别堆放,以备植苗时苗坑下垫10cm虚土和放苗后封土使用。2 栽培要… 相似文献
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雷林1号桉生长表现,产量与密度的关系 总被引:1,自引:0,他引:1
为研究雷林1号桉作为短轮伐期人工林经营的适宜密度,1984伐期人工林经营的适宜密度,1984年在海南省东部滨海丘陵台地区采用1.0m×1.0m、1.0m×1.5m、1.0m×2.0m和1.5m×1.5m等4种密度进行试验研究。经9年观测,结果表明:前两种密度经营适于短轮伐期薪材林,首采年龄为4-5年;若经营短轮伐期用材林,宜采用1.5m×1.5m或1.0m×2.0m的密度,植后8年左右采收。雷林1 相似文献
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在呈贡劣质山地对墨西哥柏、银荆树植树造林进行了不同整地方式、植塘规格、种植密度、抚育方式的试验。结果:撩壕整和水平台地的保存率及幼树生长量优于块状整地,且在阴坡深草地段尤为显著。3种植塘规格(60cm×60cm×60cm,50cm×50cm×50cm,40cm×40cm×40cm)对墨西哥柏的保存率和高、径生长差异不显著,对银荆差异极显著,大塘优于小塘。3种种植密度(1.5m×1.5m,1.5m× 相似文献
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楸树造林密度及其效应的研究 总被引:1,自引:0,他引:1
楸树造林密度7年试验总结。在7种造林密度中,树高最高(平均5.13m)的密度为21m×1m、3m宽窄行,最低(平均4.40m)的密度为2m×2m,相差16.6%;最大胸径(平均7.4cm)和最大单株立木材积(平均0.00866m ̄3)的密度为3m×4m,最小胸径(平均5.7cm)和最小单株立木材积(平均0.00471m ̄3)的密度为2m×2m,胸径相差29.8%,材积相差84.9%;密度居中的2m×1m、6m宽窄行及3m×3m,对光照的利用较佳,冠下平均光照强度0.80—0.95万勒克司,冠下、株间、行间光照平均透过率分别为12.4—14.4%、16.0—21.2%、50.8—59.1%;2m×1m、6m宽窄行的光台强度较2m×2m增加20.1%;密度愈小,郁闭愈晚,径阶偏向大径阶分布,密度愈大,郁闭愈早,径阶偏向小径阶分布,并需较早的间伐。 相似文献
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5年的试验研究结果表明,土壤厚度、整地穴规格、适栽树种、造林用苗、抚育方法等都对石质丘陵造林成活率和保存率产生影响。土层越厚幼林保存率越高;整地穴规80×80×70cm的造林平均保存率96%,比整地穴规40×40×30cm的造林保存率高20%,比铲草皮后边挖小明穴边造林保存率高37%;栽植火炬松容器苗幼林保存率76.2%,比栽植火炬松裸根苗保存率高17.2%;全面松土除草或以耕代抚幼林平均保存率93%,比株周圆块状、规格为100×100cm抚育保存率高7.4% 相似文献
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矮、密栽培是果树栽培发展的大趋势,对于乔砧的树怎样才能实现矮、密、早、丰呢?我们采用梨树斜栽的方法,达到了1年花、2年果、3年产、4年或5年丰产的目的。试验方法如下:1 试验材料和方法试验材料为1年生砀山梨嫁接苗,苗平均高150cm,地径平均1.2cm。1996年春,我们在高平市果园按2m×3m的株行距与地表呈45°夹角斜栽了50株砀山梨,同时,用常规的方法栽植25株砀山梨进行对比试验。1.1 栽植与当年整形栽植穴100cm深,直径80cm,施20kg羊粪(或农家肥)、5kg复合肥,栽后浇水两桶… 相似文献
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白夹竹生物学特性观察 总被引:3,自引:0,他引:3
经观察,白夹竹鞭梢生长期6-11月,鞭分布在土壤上层1-15cm。鞭年生长1m左右。笋芽3-4月萌动,笋从5月初长出地面至5月底不再出笋,历时28天左右,每公顷大年笋10000个左右,上林率为29.54%,虫退笋率为43.98%,自然 笋率为26.48%,上林率,大年高于小年,初期,盛期出笋高于末期出笋。竹笋从出土到长成幼竹,历时60天左右,竹笋高生长,一般夜晚稍大于白天,笋箨有吐水同象,1985 相似文献
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毛竹春笋生长与笋芽地下分布深度的关系研究 总被引:1,自引:0,他引:1
为探讨毛竹春笋生长状况与笋芽地下分布深度的关系,对山地毛竹林进行调查分析。结果显示:笋芽地下分布的土层深度对出笋直径有显著影响,笋芽分布越深,出笋直径越大;分布在10~20 cm深土层的笋芽出笋数量最多;分布在土层深20 cm以上的笋芽长出的笋最易出笋成竹,而分布在0~10 cm浅层土壤的笋芽最容易退笋。因此,在毛竹林经营中,应探索引导笋芽向深层土壤分布的技术措施,以实现多出笋、出大笋的生产目标。 相似文献
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Effects of photosynthetic photon flux density (PPFD) on leaf gas exchange of lychee (Litchi chinensis Sonn.) were studied in field-grown "Kwai May Pink" and "Salathiel" orchard trees and young potted "Kwai May Pink" plants during summer in subtropical Queensland (27 degrees S). Variations in PPFD were achieved by shading the trees or plants 1 h before measurement at 0800 h. In a second experiment, potted seedlings of "Kwai May Pink" were grown in a heated greenhouse in 20% of full sun (equivalent to maximum noon PPFD of 200 micromol m(-2)xs(-1)) and their growth over three flush cycles was compared with seedlings grown in full sun (1080 micromol m(-2)xs(-1)). Young potted plants of "Kwai May Pink" were also grown outdoors in artificial shade that provided 20, 40, 70 or 100% of full sun (equivalent to maximum PPFDs of 500, 900, 1400 and 2000 micromol m(-2)xs(-1)) and measured for shoot extension and leaf area development over one flush cycle. Net CO2 assimilation increased asymptotically in response to increasing PPFD in both orchard trees and young potted plants. Maximum rates of CO2 assimilation (11.9 +/- 0.5 versus 6.3 +/- 0.2 micromol CO2 m(-2) s(-1)), dark respiration (1.7 +/- 0.3 versus 0.6 +/- 0.2 micromol CO2 m(-2) s(-1)), quantum yield (0.042 +/- 0.005 versus 0.027 +/- 0.003 mol CO2 mol(-1)) and light saturation point (1155 versus 959 micromol m(-2) s(-1)) were higher in orchard trees than in young potted plants. In potted seedlings grown in a heated greenhouse, shoots and leaves exposed to full sun expanded in a sigmoidal pattern to 69 +/- 12 mm and 497 +/- 105 cm(2) for each flush, compared with 27 +/- 7 mm and 189 +/- 88 cm(2) in shaded seedlings. Shaded seedlings were smaller and had higher shoot:root ratios (3.7 versus 3.1) than seedlings grown in full sun. In the potted plants grown outdoors in 20, 40, 70 or 100% of full sun, final leaf area per shoot was 44 +/- 1, 143 +/- 3, 251 +/- 7 and 362 +/- 8 cm(2), respectively. Shoots were also shorter in plants grown in shade than in plants grown in full sun (66 +/- 5 mm versus 101 +/- 2 mm). Photosynthesis in individual leaves of lychee appeared to be saturated at about half full sun, whereas maximum leaf expansion occurred at higher PPFDs. We conclude that lychee plants can persist as seedlings on the forest floor, but require high PPFDs for optimum growth. 相似文献
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对云南省澜沧县境内分布的云南方竹出笋成竹规律进行了研究。结果表明:云南方竹出笋期为9月下旬至11月上旬,历时约40 d;初期笋的成竹率最高(达91.67%),末期笋的成竹率最低;新竹秆高、胸径分别集中在3.51~5.00 m和1.51~2.50 cm;末期笋退笋较多,退笋高度主要集中在40 cm以下;引起云南方竹退笋的主要原因是养分供给不足,其退笋数占退笋总数的73.33%;云南方竹的高生长持续70 d左右,呈现出“慢—快—慢”的生长规律。研究结果可为云南方竹的推广应用提供科学依据。 相似文献
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毛竹笋竹两用林挖掘鞭笋增产效应 总被引:4,自引:1,他引:3
通过在毛竹笋、竹两用林中挖掘鞭笋对冬笋、春笋、竹材产量和竹鞭生长情况影响的分析,结果显示:①鞭笋7月开始挖掘,每600m2冬笋产量增加113.66kg,春笋减少7.46kg,竹材增加74.12kg。②处理间各种产量无显著影响F0.05(4.46),受气象因子干扰,重复间冬笋产量有显著差异F=4.02>F0.05(3.84),春笋F=7.77>F0.01(7.01),竹材F=38.68>F0.01(7.01),有极显著影响。③2m2样方中的竹鞭段总长度增加545.0cm,竹鞭段支数增加4支,竹鞭大小无变化。④竹鞭在土壤中垂直分布15cm内鞭段总长度增加18%,鞭段支数增加10%。 相似文献
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Seedlings of Pinus pinea L. growing in plastic containers were treated with seaweed concentrate (SWC). Different concentrations of SWC were applied, 0 to 3 times, to the roots or shoots of the seedlings. Shoot application increased plant weight mainly by increasing shoot growth. This was manifested as increased shoot length and weight and a decrease in the root/shoot ratio. Root drenches did not change the total plant weight but it accelerated root growth and increased lateral root dry weight. Root growth capacity (RGC) tests for both shoot and root applications indicated an increase in root length and some increases in root number when applied as a root drench. This study indicates that root application of SWC improved seedling quality and increased the ability of seedlings to survive transplanting into pots.Abbreviations GC-MS
Gas Chromatography-Mass Spectrometry
- RGC
root growth capacity
- SWC
seaweed concentrate 相似文献
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以福建山樱花(Cerasuscampanulata)1a生实生苗为材料,研究了移植时间、叶量及土球对移植成活率和苗木生长的影响。结果表明,移植时间对成活率、地径和苗高生长都有极显著影响,以休眠期移植效果最好,其成活率、地径和苗高均最高,分别为97.07%、1.86cm和1.85m。在抽梢期和生长旺盛期移植时,摘叶移植的成活率为83.80%,是带叶移植的1.18倍,但对地径和苗高生长影响不大;带土球移植的成活率和苗高分别为81.76%和1.55cm,分别是不带土球移植的1.12倍和1.07倍,但地径生长差异不大。福建山樱花苗木移植在休眠期进行最好,其次是萌动期,在抽梢期和生长旺盛期移植,需将叶片全部摘除并带土球。 相似文献