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两种不同经营模式下杨树生物量及土壤碳储量的空间变异
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摘要:
在江苏北部地区选择宽窄行(K)和微型林网(W)2种杨农复合经营模式,研究各模式内杨树(Populus deltoids cv.35)地上部生物量、根系及土壤碳储量的空间变异,结果表明,6年生时K、W模式杨树地上部生物量分别为40.09和83.38 kg,后者高出前者108%;地上部各器官生物量随高度上升而下降,其中树干组成比例最大;杨树根系空间变异表现为随土层加深而减少,主要分布在0~40 cm土层,但W模式杨树根系分布比K模式相对更深、更均匀,更有利于进行杨农复合经营;不同经营模式土壤碳储量也存在较大差别,且表现出不同空间变异,K模式碳储量为58.74 t.hm-2,随土层加深而下降;而W模式碳储量为46.35 t.hm-2,随土层加深先下降再回升。
关键词:  杨树  生物量  根系  土壤碳储量  空间变异  
DOI:
基金项目:“十一五”国家林业科技支撑计划专题项目(2006BAD03A1505)资助
Spatial variation of poplar (Populus deltoids cv.35) biomass and soil carbon storage at two different management patterns
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Abstract:
The spatial variations of poplar(Populus deltoids cv.35) biomass and soil carbon storage were studied under two different agroforestry management patterns,wide-narrow row(K) and micro-web(W),in the north of Jiangsu Province.The results showed that the poplar aboveground biomass at age 6 under K-pattern and W-pattern were 40.09 kg and 83.38 kg,respectively,and the latter was 108% higher than the former.The aboveground organ biomass decreased with the increasing of tree height and the trunk was the largest co...
Key words:  poplar  biomass  root system  soil carbon storage  spatial variation  

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