中国农业科学院农业信息研究所 中国农学会
Agricultural Information Institute of CAAS China Association of Agricultural Science Societies
En
Ch
中国农业科学院农业信息研究所 中国农学会 主办

AI检索

订阅

返回顶部
当前位置: 首页 > 文章 > 氮磷配施对藏北退化高寒草甸群落结构和生产力的影响 应用生态学报 2014,25 (12) 3458-3468
Position: Home > Articles > Effects of nitrogen and phosphorous fertilization on community structure and productivity of degraded alpine meadows in northern Tibet,China Chinese Journal of Applied Ecology 2014,25 (12) 3458-3468

氮磷配施对藏北退化高寒草甸群落结构和生产力的影响

作  者：
宗宁;石培礼;牛犇;蒋婧;宋明华;张宪洲;何永涛
单  位：
中国科学院大学;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室拉萨高原生态试验站
关键词：
氮磷添加;植被恢复;草地改良;退化高寒草甸;西藏高原
摘  要：
施肥是退化草地初期恢复常用的管理措施,被用于改良草地群落结构和提高牧草生产力.本文以藏北轻度和重度退化高寒草甸为研究对象,设置低氮(50 kg N·hm-2·a-1,LN)、高氮(100 kg N·hm-2·a-1,HN)施肥水平,及其与磷配施组合试验(50 kg N·hm-2·a-1+50 kg P·hm-2·a-1,LN+P;100 kg N·hm-2·a-1+50 kg P·hm-2·a-1,HN+P),研究施肥梯度与施肥类型对两种退化程度高寒草甸群落结构、物种丰富度与多样性、群落生物量及其分配的影响.结果表明:单独施氮对轻度和重度退化高寒草甸群落盖度和生物量均无显著影响,而氮磷配施显著提高群落盖度及地上、地下生物量,其中LN+P处理的促进效果最显著.这表明本研究区地上生产力受到氮和磷的共同限制.施肥处理对重度退化样地总生物量无显著影响,但显著降低了根冠比.HN与HN+P处理均显著降低轻度退化群落的物种丰富度和均匀度,说明HN处理不利于轻度退化草地物种多样性和稳定性的维持.在轻度退化样地,施氮(尤其是HN处理)主要提高了禾草植物的重要值和生物量,而氮磷配施则有利于莎草类植物的生长.施肥对重度退化群落植物的重要值影响较小,主要提高了杂草生物量.说明轻度退化高寒草甸可选择低氮配施磷肥的措施,而对重度退化草地可能需要结合围栏和补播牧草等其他管理措施进行改良.
译  名：
Effects of nitrogen and phosphorous fertilization on community structure and productivity of degraded alpine meadows in northern Tibet,China
作  者：
ZONG Ning;SHI Pei-li;NIU Ben;JIANG Jing;SONG Ming-hua;ZHANG Xian-zhou;HE Yong-tao;Lhasa National Ecological Research Station,Key Laboratory of Ecosystem Network Observation and Modelling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy Sciences;University of Chinese Academy of Sciences;Key Laboratory of Ecosystem Network Observation and Modelling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy Sciences;
关键词：
nitrogen and phosphorus addition;;recovery of community;;grassland improvement;;degraded alpine meadow;;Tibetan Plateau
摘  要：
Fertilization is an effective management measure for recovery of degraded grasslands. To better understand the effects of fertilization on community structure and productivity of lightly and severely degraded alpine meadows,we conducted a fertilization experiment in northern Tibet since2008. The treatments were addition of nitrogen( N) alone( 50 kg N · hm- 2· a- 1,LN; 100 kg N·hm- 2·a- 1,HN) or addition of both phosphorus( P) and N( 50 kg N·hm- 2·a- 1+ 50 kg P·hm- 2·a- 1,LN + P; 100 kg N·hm- 2·a- 1+ 50 kg P·hm- 2·a- 1,HN + P) in each of the two types of degraded alpine meadows. N addition alone significantly affected plant community co-verage or productivity in neither the slightly nor the severely degraded alpine meadow,while addition of both N and P significantly increased plant community coverage,aboveground and belowground biomass of the alpine meadows. This suggested that productivity of this alpine meadow is colimited by N and P. HN and HN + P significantly decreased species richness and evenness in the lightly degraded grassland,indicating that HN was not beneficial for the lightly degraded grassland to maintain species diversity and community stability. N addition significantly reduced the root to shoot ratio in the severely degraded meadow. In the lightly degraded meadow,N addition alone,especially with a high amount( HN),enhanced the importance values( IV) and biomass of grasses,while fertilization with both N and P increased those of sedges. In the severely degraded meadow,fertilization had little effect on IV of grasses or sedges,but improved biomass of forbs. The results suggested that LN + P could be employed in recovery of lightly degraded alpine meadows,but other management measures such as fencing and reseeding may be needed for recovery of severely degraded alpine meadows.

相似文章

导出引用
计量
文章访问数: 13
HTML全文浏览量: 0
PDF下载量: 0

所属期刊

推荐期刊

友情链接Friendly link
农业信息研究所Agricultural information institute 农业智能知识服务平台Agricultural intelligent knowledge service platform 农业学术服务平台Agricultural Knowledge Service System 中国知网CNKI 维普网VIP 万方WANFANG DATA
联系我们Contact us

电话Tell：010-82109652-808

邮箱E-mail：agrijournal@caas.cn

服务Service
关于我们About us 意见建议Opinions and suggest
版权说明Copyright
单位：中国农业科学院农业信息研究所 中国农学会 © 2017中国农业科学院农业信息研究所 ICP备案号：京ICP备09089781号-46