干旱区生态环境知识资源中心(Arid): 中国北方天然草地的生物量分配及其对气候的响应

Arid

	中国北方天然草地的生物量分配及其对气候的响应
其他题名	Biomass Distribution of Natural Grasslands and It Response to Climate Change in North China
	王娓; 彭书时; 方精云
ISSN	1001-4675
出版年	2008
卷号	25 期号:1 页码:90-97
中文摘要	通过收集我国近20年来草地生物量的有关文献，估算了我国北方天然草地根冠比（R／S）及地下生产力占总生产力比例（fBNPP）的大小及其对气候变化的响应。结果表明：不同草地类型R／S比及fBNPP变异较大，根冠比为1．66～15．21，fBNPP为0．29～0．98；荒漠草原的R／S比及fBNPP较大，但变幅较小；森林草原R／S比和fBNPP较小，但变幅较大；R／S比及fBNPP随年降水的增加而显著降低，随年平均气温增加而降低的趋势不明显。采用生长季最大生物量估算的方法可能高估了R／S比fBNPP。长期、高质量的生物量观测数据，尤其是地下生物量的数据以及开展不同研究方法对生产力估算结果的影响，对于准确评价草地在区域及全球碳循环中的作用是十分必要的。
英文摘要	Abovegrouud and belowground biomasses and their distribution are the important parameters of carbon cycle. Many achievements about the distribution pattern of aboveground biomass have been achieved, but the studies about helowground bionlass are very. limited. In this paper, the root-shoot ratios and fBNPP（defined as the fraction of belowground net primary productivity （BNPP） iu total NPP） as well as their relationships with climatic variables are lucubrated by synthesizing the references about biomass of grasslands in uorth China. The results show that the root-shoot ratios and fBNPP are obviously different from different grasslands types, and they vary in ranges of 1.66 - 15.21 and 0.29 -0.98 respectively. In general, the root-shoot ratio and fBNPP of desert steppe are high, but their change extent is low; the root-shoot ratio and fBNPP of forest grasslands are low, but their change extent is high. There is a negative correlation between the root-shoot ratio and fBNPP, and the climatic factors, that is the root-shoot ratio and fBNPP, are significantly decreased with the increase of annual precipitation, but their decrease trend with the increase of annual temperature is not so significant. The study results also reveal that tile values of root-shoot ratio and fBNPP might be overestilnated if the maximum biomass in the growth season of grasslands is used. It is necessary to research the effects of different study methods on estimating the NPP of grasslands and veraciously evaluate the importance of grasslands in regional and global carbon circle using the long-term measured bionlass data, especially the data of belowground bionlass.
中文关键词	草地 ; 根冠比 ; 生物量 ; 温度 ; 降水 ; 中国
英文关键词	biomass distribution root-shoot ratio grasslands NPP precipitation temperature
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:3255525
来源机构	北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222309
作者单位	北京大学环境学院生态学系, 北京 100871, 中国
推荐引用方式 GB/T 7714	王娓,彭书时,方精云. 中国北方天然草地的生物量分配及其对气候的响应[J]. 北京大学,2008,25(1):90-97.
APA	王娓,彭书时,&方精云.(2008).中国北方天然草地的生物量分配及其对气候的响应.,25(1),90-97.
MLA	王娓,et al."中国北方天然草地的生物量分配及其对气候的响应".25.1(2008):90-97.