ISWC OpenIR  > 水保所知识产出(1956---)
黄土高原不同封育年限草地土壤与 植物根系的生态化学计量特征
赵晓单1,3; 曾全超2; 安韶山1,3; 方瑛2; 马任甜2
Source Publication土壤学报

年,保持相对平稳。0~20 cm 土层土壤的碳氮比(C∶N)、碳磷比(C∶P)、氮磷比(N∶P)分别
为9.04~9.63、19.62~32.27、2.14~3.37,20~40 cm 土层土壤的分别为8.68~9.22、15.74~26.32、
范围分别为357.6~381.4 g kg-1、7.35~8.18 g kg-1、0.54~0.70 g kg-1;根系中的C元素含量随封育年

Other Abstract

【Objective】The knowledge about vegetation succession,is essential to veget ation
restoration,especially in steppe regions on the Loess Plateau. Recently stoichiometry has been effectively
used to illustrate plant community succession and vegetation restoration. Balance of carbon(C),nitrogen
(N),and phosphorus(P)in plant has been a hotspot of the research on biogeochemical cycle and
plant ecology. However,most of the studies have focused on nutrients in plant leaves,and few did on the
elements in plant roots,let alone,on ecological stoichiometrical characteristics of the soils and plant roots
in steppe regions under enclosure on the Loess Plateau,relative to enclosure history. 【Method】This
paper explored ecological stoichiometrical characteristics of the soils and plant roots in grasslands different
in enclosure history(1 a,12 a,20 a and 30 a)on the Yunwu mountain of Ningxia Province. The steppe
region under study is located between 106°26′E and 106°30′E and between 35°59′N and 36°02′N. The
YunwuMountain lies across the center of the Loess Plateau,with an altitude ranging from 1 000 to 1 800 m
above sea level. The study area has a semi-arid climate,characterized by heavy seasonal rainfalls causing
recurrent flooding and drought,with mean annual temperature being 5 ℃ and mean annual precipitation
being 445 m. The typical natural vegetation of this region is grassland. Samples of the soils and plant roots
in the region were collected and analyzed for organic carbon(SOC),total nitrogen(TN),and total
phosphorus(TP),and their stoichiometrical ratio and interrelationships,using the time-space substitution
method,based on the principles of stoichiometry. 【Result】Result show that with the enclosure going on,
soil bulk density decreased gradually,SOC and TN varied more significantly,while TP did less. In the
early years of enclosure,SOC and TN declined first and then rose till the enclosure reached 20 or 30 years
old,when they leveled off. Soil organic carbon,total nitrogen and total phosphorus varied in the range of
12.88~22.37,1.41~2.48 and 0.66~0.74 in the 0~20 cm soil layer and in the range of 9.58~18.45,
1.09~2.12 and 0.58~0.70 in the 20~40 cm soil layer,respectively. Soil C∶N,C∶P and N∶P ratio
varied in the range of 9.04~9.63,19.62~32.27 and 2.14~3.37,respectively,in the 0~20 cm soil layer
and in the range of 8.68~9.22,15.74~26.32 and 1.80~3.03,respectively,in the 20~40 cm soil layer.
Soil organic carbon,total nitrogen and total phosphorus were significantly correlated with each other. C,
N and P concentration in the roots varied in the range of 357.6 to 381.4 g kg-1,7.35 to 8.18 g kg-1 and
0.54 to 0.70 g kg-1,respectively. In the root,C concentrations increased gradually with enclosure going
on,whereas N and P concentrations were lower than the world’s average. C∶N,C∶P and N∶P ratio in
the root varied in the range of 44.52~59.02,574.7~793.9 and 10.87~15.14,respectively,during the
period of enclosure,showing that C∶N varied more drastically,while C∶P and N∶P did less. Ecological
stoichiometric characteristics of C∶ N∶ P in plant roots were more affected by soil than by the root per se.Soil TP affected the ecological stoichiometrical characteristics of carbon,nitrogen,and phosphorus in plant
roots(p<0.01)more significantly than soil TN did(p<0.05). Besides,the vegetation in this region
tended to be restrained by soil N concentration after the grassland was enclosed. 【Conclusion】The study on
effects of enclosure on C,N and P in the soil and plant root of the grassland,their ecological stoichiometric
characteristics and interrelationships may provide some scientific bases for the study on material recycling in
the grassland ecosystem and nutrient restraints in the vegetation ecosystem,and some scientific references for
accurate evaluation of ecological benefits of the policies or strategies of“Grain for Green”and“Enclosure of

Keyword云雾山 封育年限 土壤 根系 生态化学计量学 碳氮磷
Indexed By中文核心期刊要目总览
Document Type期刊论文
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
赵晓单,曾全超,安韶山,等. 黄土高原不同封育年限草地土壤与 植物根系的生态化学计量特征[J]. 土壤学报,2016,53(6):1541-1551.
APA 赵晓单,曾全超,安韶山,方瑛,&马任甜.(2016).黄土高原不同封育年限草地土壤与 植物根系的生态化学计量特征.土壤学报,53(6),1541-1551.
MLA 赵晓单,et al."黄土高原不同封育年限草地土壤与 植物根系的生态化学计量特征".土壤学报 53.6(2016):1541-1551.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[赵晓单]'s Articles
[曾全超]'s Articles
[安韶山]'s Articles
Baidu academic
Similar articles in Baidu academic
[赵晓单]'s Articles
[曾全超]'s Articles
[安韶山]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[赵晓单]'s Articles
[曾全超]'s Articles
[安韶山]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.