金沙江干旱河谷退化草地群落对氮磷施肥的反应

植物研究 ›› 2004, Vol. 24 ›› Issue (1): 59-64.

金沙江干旱河谷退化草地群落对氮磷施肥的反应

张彦东^1,2, 沈有信², 刘文耀²

1. 东北林业大学森林资源与环境学院, 哈尔滨 150040;
2. 中国科学院西双版纳热带植物园, 昆明 650223

收稿日期:2003-02-06 出版日期:2004-03-15 发布日期:2016-06-14
作者简介:张彦东(1974-), 男, 博士研究生, 主要从事植物生态学及造林学研究。
基金资助:
中国科学院特别支持项目册地灾害——泥石流、滑坡防治研究。

Fertilization effects of N、P on a grass community at the dryvalley of Jinsha River

ZHANG Yan-Dong^1,2, SHEN You-Xin², LIU Wen-Yao²

1. School of Forest Resource and Environments, Northeast Forestry University, Harbin 150040;
2. Xishuangbanna Tropical Botanic Garden, the Chinese Academy of Sciences, Kunming 650223

Received:2003-02-06 Online:2004-03-15 Published:2016-06-14

摘要/Abstract

摘要： 在云南省境内的金沙江干旱河谷区, 选择退化严重的草地群落研究氮磷施肥对群落动态的影响。经过一个生长季的施肥处理, 结果表明, 除大量施磷肥处理(20 g·a^-1·m^-2)时, 可能因施磷过多群落生物量和密度没有出现增加外。其余的施氮和施磷处理均导致群落地上生物量和密度增加, 而且施氮处理引起群落地上生物量和密度增加的程度都高于施磷处理。说明在干旱河谷退化严重的草地生态系统, 氮是限制系统恢复的主要因素。施肥后禾本科草本植物密度大量增加, 而乔灌木密度增加不明显, 群落在短期内变成以禾本科草本植物为主的状态。施氮和施磷没有引起群落种数量和植物多样性指数的明显变化。试验结束时土壤的铵态氮、硝态氮和有效磷浓度没因施肥而增加, 但施肥处理的植物体氮和磷浓度增加。

关键词: 干旱河谷, 氮磷肥, 草地群落, 金沙江, 植物多样性

Abstract: At the dry valley along Jingsha River, a highly degraded grass community was selected to determine the effect of N、P fertilization on community dynamics.After one growing season of N and P application, the results showed that the above ground biomass and species density increased except the one with the highest P (20 g& #183;a^-1& #183;m^-2)treatment, and the increases caused by N applications were greater than that of P applications, therefore N was the limiting factors for the restoration of community.After the treatment, the density of Gramineae species increased sharply, but that of tree and shrub species did not increase significantly, so we can conclude that the community has become Gramineae dominant within the short term.Both N and P treatment did not caused significant changes in species type and diversity.Up to the end of treatment, NH4⁺、NO3^- and available P in the soil did not increase with the application of N、P, but the content of N and P in the biomass increased。

Key words: dry valley, N and P fertilization, grass community, Jinsha River, biodiversity

张彦东, 沈有信, 刘文耀. 金沙江干旱河谷退化草地群落对氮磷施肥的反应[J]. 植物研究, 2004, 24(1): 59-64.

ZHANG Yan-Dong, SHEN You-Xin, LIU Wen-Yao. Fertilization effects of N、P on a grass community at the dryvalley of Jinsha River[J]. Bulletin of Botanical Research, 2004, 24(1): 59-64.

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