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渭北黄土区刺槐人工林氮、磷生态化学计量特征
刘冰燕; 陈云明; 曹扬 
2016
Source Publication西北林学院学报
Volume31Issue:1Pages:1-6
Abstract

以渭北黄土区20、30a和44a刺槐人工林生态系统为对象,研究了其内植物-枯落物-土壤
的氮(N)磷(P)化学计量特征。结果表明:刺槐叶的N、P含量最高,干的N、P含量最低。土壤表
层是N的富集区,而P在土层中分布均匀。随着林龄的增加,刺槐叶、根和枯落物的N、P含量呈
下降趋势(p<0.05),刺槐枝的N、P含量呈上升趋势(p<0.05),刺槐干的N、P含量无显著变化;
土壤中的N含量呈增加趋势,P含量则相反。刺槐叶、枝、干和枯落物不同林龄间的N∶P无显著
性差异,平均值分别为18.75、21.39、15.43和17.20;30a和44a刺槐根的N∶P分别是20a的
2.37和2.30倍(p<0.05)。土壤的N∶P随着林龄的增加而增大,各层土壤20a和44a时的N∶
P均达到显著性差异(p<0.05)。土壤的N∶P随着土层深度的增大而减小,表层土壤的N∶P显
著高于其下各土层(p<0.05)。表明P是该地区刺槐生长的主要限制元素。

Other Abstract

Taking 20-,30-and 44-year-old Robinia pseudoacacia plantations growing in Weibei Loess Plateau
region as research objects,nitrogen(N)and phosphorus(P)stoichiometry characteristics in tree-littersoil
systems were examined.The results showed that the contents of N and P were the highest in the leaves
and lowest in the stems.N was mainly enriched in surface soil,and P distributed uniformly in all the soil
layers.During stand development,along with the increase of stand age,the contents of N and P tended to
decrease(p<0.05)in the leaves,roots and litter layer,while increase(p<0.05)in the branches.No significant
differences were observed in the ratios of nitrogen to phosphorous among the stands with different
ages in the leaves,branches,stems and litters,the average values were 18.75,1.39,15.43and 17.20,respectively.
The N∶P ratios of roots in 30-and 44-year-old stands were 2.37and 2.30times more than in
20-year-old stand(p<0.05).The soil N∶P ratio increased with stand age.The N∶P ratios in different
soil layers were significantly different(p<0.05)between 20-and 44-year-old stands.The N∶P ratio decreased
with soil depth.The N∶P ratio in surface soil was significantly(p<0.05)higher than other soil
layers.it was found that phosphorous was the main limited element for Robinia pseudoacacia growth in the
area.

Keyword黄土区 刺槐人工林 林龄 N、p含量 N∶p 化学计量
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8693
Collection水保所知识产出(1956---)
Affiliation西北农林科技大学水土保持研究所,黄土高原土壤侵蚀与旱地农业国家重点实验室
Recommended Citation
GB/T 7714
刘冰燕,陈云明,曹扬 . 渭北黄土区刺槐人工林氮、磷生态化学计量特征[J]. 西北林学院学报,2016,31(1):1-6.
APA 刘冰燕,陈云明,&曹扬 .(2016).渭北黄土区刺槐人工林氮、磷生态化学计量特征.西北林学院学报,31(1),1-6.
MLA 刘冰燕,et al."渭北黄土区刺槐人工林氮、磷生态化学计量特征".西北林学院学报 31.1(2016):1-6.
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