| 高施氮量对高寒矮嵩草甸主要类群和多样性及质量的影响 |
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| 引用本文： | 沈振西,陈佐忠,周兴民,周华坤.高施氮量对高寒矮嵩草甸主要类群和多样性及质量的影响[J].草地学报,2002,10(1):7-17. |
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| 作者姓名： | 沈振西 陈佐忠 周兴民 周华坤 |
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| 作者单位： | 1. 中国科学院西北高原生物研究所,西宁,810001
2. 中国科学院植物研究所,北京,100093 |
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| 基金项目： | 国家重点基金研究发展规划项目 (G19980 40 80 3 -4 )，中国科学院知识创新工程项目 (KSCX2 -1-0 7)，中国科学院海北站基金项目资助 |
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| 摘 要： | 研究高寒矮嵩草草甸高强度施氮试验（150和300kgN/hm^2)对不同在群的影响。结果表明，昌类植物的反应较大，其综合优势比呈明显增大趋势，非豆科杂草次之，莎草类和豆科杂草的反应不显著。增施氮肥能明显降低矮嵩草草甸的植物多样性，其草甸质量指数以施氮150kg/hm^2最高，过量施氮（300/hm^2)并不再提高草甸质量。其地上生物量对施氮的反应比多样性和草甸质量指数的变化滞后，地上生物总量在施氮后明显增加，其中禾草类明显增加，杂类草则明显降低。7月的降水量及其分布对施氮的效果影响较大。土壤水分状况对施肥效果十分重要。
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| 关 键 词： | 高施氮量 高寒矮嵩草甸 多样性 草甸质量 地上生物量 植物类群 |
| 文章编号： | 1007-0435(2002)01-0007-11 |
Responses of Plant Groups, Diversity and Meadow Quality to Hiht-rate N Fertilization on Alpine Kobresia humilis Community |
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| SHEN Zhen xi ,CHEN Zuo zhong ,ZHOU Xing min ,ZHOU Hua kun.Responses of Plant Groups, Diversity and Meadow Quality to Hiht-rate N Fertilization on Alpine Kobresia humilis Community[J].Acta Agrestia Sinica,2002,10(1):7-17. |
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| Authors: | SHEN Zhen xi CHEN Zuo zhong ZHOU Xing min ZHOU Hua kun |
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| Institution: | SHEN Zhen xi 1,CHEN Zuo zhong 2,ZHOU Xing min 1,ZHOU Hua kun 1 |
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| Abstract: | The experiment with three levels of N fertlizer (0?150 and 300kg N/hm 2) was conducted for three years at alpin Kobresia humilis meadow to study responses of different plant groups and some species. The response of grasses was more significance than Non leguminous forbs to nitrogen addition. The synthetic dominated ratio (SDR) of grasses increased, and that of non leguminous forbs decreased with the increase of nitrogen, whereas the SDR of sedges and leguminous forbs were not significantly affected by N fertilizer. Plant diversity decreased and forage quality increased with the increase of nitrogen. Index of meadow quality (IMQ) was the highest at 150kg N/hm 2 plot, and showed no significant difference between 150 and 300kg N/hm 2 plot. Excessive nitrogen application did not improve the IMQ. Response of above ground biomass of plant groups was lagged when compared with plant diversity and IMQ. Total above ground biomass was significant increased with the nitrogen application. There were different responses of above ground biomass among plant groups to the nitrogen application. The results showed that the above ground biomass of grasses was significantly increased with N fertilizer application, and that of forbs was decreased. The responses of plant grounps to nitrogen application were more affected by precipitation and its distribution in July, therefore, the status of soil water after nitrogen application was a key factor to the responses of plant groups. |
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| Keywords: | Alpine Kobresia humilis meadow Nitrogen fertilization Diversity Meadow quality Above ground biomass |
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