[1]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.[doi:10.3969/j.issn.1001-7461.2016.01.01]
　LIU Bing-yan,CHEN Yun-ming*,CAO Yang. Nitrogen and Phosphorus Stoichiometry Characteristics of Robinia pseudoacacia Plantation in Weibei Loess Plateau Region[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2016,31(1):1-6.[doi:10.3969/j.issn.1001-7461.2016.01.01]
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 渭北黄土区刺槐人工林氮、磷生态化学计量特征()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第31卷
期数:
2016年第1期
页码:
1-6
栏目:
出版日期:
2016-01-31

文章信息/Info

Title:
 Nitrogen and Phosphorus Stoichiometry Characteristics of Robinia pseudoacacia Plantation in Weibei Loess Plateau Region
文章编号:
1001-7461(2016)01-0001-06
作者:
 刘冰燕; 陈云明*; 曹扬
 （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，陕西 杨陵 712100）
Author(s):
 LIU Bing-yan; CHEN Yun-ming*; CAO Yang
 (State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling,Shaanxi 712100,China)
关键词:
 ; 黄土区; 刺槐人工林; 林龄; N、P含量; N∶P; 化学计量
Keywords:
 ; Loess Plateau region;  Robinia pseudoacacia plantation;  stand age;  N and P content;  N∶P ratio;  stoichiometry
分类号:
S718.5
DOI:
10.3969/j.issn.1001-7461.2016.01.01
文献标志码:
A
摘要:
 以渭北黄土区20、30 a和44 a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；30 a和44 a刺槐根的N∶P分别是20 a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20 a和44 a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。
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-litter-soil 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 18.75,1.39,15.43 and 17.20,respectively.The N∶P ratios of roots in 30- and 44-year-old stands were 2.37 and 2.30 times 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.

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备注/Memo

备注/Memo:
 收稿日期：2015-02-26修回日期：2015-03-24
基金项目：国家自然科学基金项目(41201088)；国家自然科学基金项目(41371506)；中国科学院西部之光(K318021304)；高校基本科研业务费(2014YB056)。
作者简介：刘冰燕，女，硕士研究生，研究方向：森林生态与水土保持。E-mail:lbyazbc@126.com
*通信作者：陈云明，男，研究员，研究方向：植被生态与水土保持。E-mail:ymchen@ms.iswc.ac.cn
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