干旱区生态环境知识资源中心(Arid): 天山北坡不同海拔梯度山地草原生态系统地上净初级生产力对气候变化及放牧的响应

Arid

	天山北坡不同海拔梯度山地草原生态系统地上净初级生产力对气候变化及放牧的响应
其他题名	Impacts of grazing and climate change on the aboveground net primary productivity of mountainous grassland ecosystems along altitudinal gradients over the Northern Tianshan Mountains,China
	周德成; 罗格平; 韩其飞; 尹昌应; 李龙辉; 胡玉昆
来源期刊	生态学报
ISSN	1000-0933
出版年	2012
卷号	32 期号:1 页码:81-92
中文摘要	以天山北坡三工河流域为例,利用改进后的Biome-BGC模型分别模拟了仅气候变化和气候变化与放牧联合作用下研究区不同海拔梯度3种山地草原生态系统(低山干旱草原(Lowermountain arid grassland,LAG),森林草甸草原(Forest meadowgrassland,FMG),高寒草甸草原(Alpine meadow grassland,AMG))19592009年地上净初级生产力(Aboveground net primaryproduction,ANPP)的动态,并通过假设27种放牧强度情景(08羊/hm~2)模拟了其ANPP随放牧强度增加的变化趋势。近50a气候变化致使研究区各海拔梯度草原生态系统ANPP整体均呈上升趋势,但在放牧联合作用下,不同草原类型ANPP变化趋势差异显著;放牧导致FMG和AMG的ANPP呈下降态势,分别减少30.0%和33.2%,对比之下,由于1980年前较低放牧强度促进了LAG的ANPP,放牧导致其ANPP整体增加1.3%。随着放牧强度增加,LAG的ANPP呈先增后减趋势,且在干旱年份最为显著;而FMG和AMG的ANPP呈显著非线性递减趋势。这些结果表明,近50a气候波动可能有利于中亚干旱区山地草原生态系统生产力的提高,但日益增强的放牧活动导致其净初级生产力显著降低;放牧对FMG与AMG生产力的负面效应随放牧强度增加而增强,但适度放牧可能促进LAG净初级生产力,尤其在干旱年份。
英文摘要	Grazing and climate change are the two key factors influencing the aboveground net primary productivity(ANPP) in the grassland ecosystems.However,the impacts of grazing on ANPP are still in considerable disagreement,and little is known about its combined effects with climate change in the arid mountainous grassland ecosystems.In this study,we simulated the ANPP dynamics of mountainous grassland ecosystems along altitudinal gradients(i.e.LAG: lower-mountain arid grassland,FMG: forest meadow grassland,and AMG: alpine meadow grassland) over the Northern Tianshan Mountains under the impacts of climate change only(Clm) and by the combined effects with grazing(ClmGra) during 19592009 using a modified Biome-BGC model,and modeled the responses of the ANPP to grazing intensities(GIs) by setting 27 different levels of GIs(ranging from 0 to 8 sheep/hm~2) as well.Model results indicated that the ANPP increased generally with the warm-humid climate change only in all the three grassland ecosystems,whereas the impacts of grazing on ANPP varied with grassland type.Grazing decreased ANPP in FMG and AMG by 30.0% and 33.2% respectively,in contrast,it resulted in a 1.3% increase of ANPP in LAG because the lower GIs before 1980 generally promoted the ANPP over LAG.Moreover,the responses of ANPP to the increasing GIs varied with grassland type,and the ANPP in LAG decreased significantly after a moderate increase and this changing trend is especially significant during drought years.Nevertheless,the ANPP always decreased non-linearly with increasing GIs in both FMG and AMG.These results suggested that the climate change in the past 50 years may benefit the productivity of the mountainous grassland ecosystem in the arid region of central Asia,but the increasing GIs decreased the productivity substantially.The ANPP of FMG and AMG decreased non-linearly with elevating GIs,but the ANPP may increase under the impact of lower GIs in LAG,especially in drought years.Nevertheless,there are uncertainties in our simulations and the responses of the productivity to increasing GIs together with the underlying mechanisms in arid mountainous grassland ecosystems,more field experiments are needed to validate these preliminary results.
中文关键词	天山北坡 ; 山地草原生态系统 ; 地上净初级生产力 ; 气候变化 ; 放牧
英文关键词	Northern Tianshan Mountains mountainous grassland ecosystem aboveground net primary production climate variability grazing
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4435427
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228416
作者单位	中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	周德成,罗格平,韩其飞,等. 天山北坡不同海拔梯度山地草原生态系统地上净初级生产力对气候变化及放牧的响应[J]. 中国科学院新疆生态与地理研究所,2012,32(1):81-92.
APA	周德成,罗格平,韩其飞,尹昌应,李龙辉,&胡玉昆.(2012).天山北坡不同海拔梯度山地草原生态系统地上净初级生产力对气候变化及放牧的响应.生态学报,32(1),81-92.
MLA	周德成,et al."天山北坡不同海拔梯度山地草原生态系统地上净初级生产力对气候变化及放牧的响应".生态学报 32.1(2012):81-92.