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黄土高原农牧交错带退耕坡地苜蓿 - 铁杆蒿 群落养分分布特征
张燕江1,2; 邱莉萍1,2; 程积民2; 张兴昌2
2015
Source Publication干 旱 地 区 农 业 研 究
Volume35Issue:5Pages:211-216
Abstract

植物群落养分的空间分布反映了生态系统物质循环特征,可以为揭示生态系统资源的有效性及生态
系统中植物群落的演替过程提供依据。本研究以黄土高原农牧交错带退耕坡地苜蓿 - 铁杆蒿群落为对象,分析其
生物量和养分含量的空间分布特征。结果表明:退耕地苜蓿 - 铁杆蒿群落坡上部以苜蓿为主导物种,坡下部以铁
杆蒿为主导物种,坡中部由二者共同主导。同一植物的生物量和 N 含量具有相似的空间结构,并且与植物种类有
关;苜蓿和铁杆蒿 P 含量均以球状模型最佳,K 含量的空间分布均以高斯模型最佳。苜蓿 - 铁杆蒿群落生物量和
养分含量具有较强的空间依赖性,其空间变异主要由结构性因素决定。苜蓿和铁杆蒿生物量和养分含量的自相关
性随距离变化表现出相似的趋势,但随生物量和养分种类的不同而异,且铁杆蒿生物量和养分含量的自相关性大
于苜蓿。随着人工草地向天然草地的演替,群落生物量和养分含量的空间自相关性和空间依赖性逐渐增强。

Other Abstract

The distribution of nutrients in plant community could reflect the cycling of nutrients in ecosystems,
and thus provide evidence for the availability of soil resources for the ecosystems as well as for the understanding of
the evolution of plant community in the ecosystems. In this study,we analyzed the spatial distribution of biomass
and nutrients in Medicago sativa - Artemisia sacrorum Ledeb community along an abandoned slope in the cropping-
pastoral ecotone of the Loess Plateau. The objectives were to understand how nutrients were distributed along aban-
doned grass slope and to establish the relationships between nutrients distribution and community succession. The
results showed that the grass communities were dominated by Medicago sativa in the upper slope,by Artemisia
sacrorum Ledeb in the lower slope,and by both of them in the middle slope. Plant biomass and N content had simi-
lar spatial distribution patterns,which varied among plant species. The best fit models of the spatial distribution for
both Medicago sativa and Artemisia sacrorum Ledeb were spherical model for P content,and Gaussian model for K
content,respectively. The biomass and nutrients contents in the Medicago sativa - Artemisia sacrorum Ledeb com-
munity has a relatively strong spatial dependence. The spatial variability of them was mainly due to the construc-
tional factors. The spatial auto correlations of each variable showed similar trend with distance but varied with varia-bles. Additionally,the spatial auto-correlation of Artemisia sacrorum Ledeb was greater than that of Medicago sati-
va. The results from this study suggested that the spatial auto correlation and dependence of grass biomass and nu-
trients contents became increased with the succession of artificial grass community to natural community.

Keyword农牧交错带 退耕草地 养分含量 空间分布
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/361005/8388
Collection水保所知识产出(1956---)
Corresponding Author程积民
Affiliation1.西北农林科技大学资源环境学院,陕西 杨凌 712100
2.西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西 杨凌 712100
Recommended Citation
GB/T 7714
张燕江,邱莉萍,程积民,等. 黄土高原农牧交错带退耕坡地苜蓿 - 铁杆蒿 群落养分分布特征[J]. 干 旱 地 区 农 业 研 究,2015,35(5):211-216.
APA 张燕江,邱莉萍,程积民,&张兴昌.(2015).黄土高原农牧交错带退耕坡地苜蓿 - 铁杆蒿 群落养分分布特征.干 旱 地 区 农 业 研 究,35(5),211-216.
MLA 张燕江,et al."黄土高原农牧交错带退耕坡地苜蓿 - 铁杆蒿 群落养分分布特征".干 旱 地 区 农 业 研 究 35.5(2015):211-216.
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