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
2016
Source Publication土壤学报
Volume53Issue:6Pages:1541-1551
Abstract

土高原特别是干草原地区植被演替的研究比较薄弱。当前植物生态化学计量学的研究主要集中在植物叶片方面,对根系的研究较少。选取宁夏云雾山草原植被不同封育年限的土壤和植物样品,以生态化学计量学原理为基础,测定并分析了土壤与根系的碳(C)、氮(N)、磷(P)及其生态化学计量比与相互关系。结果表明:(1)随着封育年限的增加,土壤容重逐渐减小,土壤有机碳和全氮变异性较大,全磷变异性较小,且封育初期土壤有机碳和全氮含量先降后升,至封育20、30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、1.80~3.03。土壤有机碳与全氮、全磷之间存在极显著的正相关。(2)植物根系C、N、P含量变化范围分别为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元素含量随封育年限的增加逐渐升高,N、P元素含量均小于全球平均值。根系C∶N随着封育年限的增加变异性较大,C∶P、N∶P随着封育年限的增加变异性较小。(3)植物根系的C∶N∶P化学计量特征受土壤的影响调控大于其自身,且土壤磷含量对植物根系C∶N∶P生态化学计量特征影响的显著性(p0.01)大于土壤氮含量(p0.05)。此外,该地区封禁后,草地生产力易受到土壤N含量的限制。

Other Abstract

The knowledge about vegetation succession,is essential to vegetation 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. MethodThis 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°26E and 106°30E and between 35°59N and 36°02N. 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 °C 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. ResultResult 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 seSoil TP affected the ecological stoichiometrical characteristics of carbon,nitrogen,and phosphorus in plant roots(p0.01)more significantly than soil TN did(p0.05). Besides,the vegetation in this region tended to be restrained by soil N concentration after the grassland was enclosed. ConclusionThe 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 grassland”..

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
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8736
Collection水保所知识产出(1956---)
Affiliation1.中国科学院水利部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
2.西北农林科技大学资源环境学院
3.中国科学院大学
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.
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