科尔沁沙质草地植物群落的放牧退化及其自然恢复过程

摘要/Abstract

摘要：

为了了解不同放牧强度对我国北方沙质草地的影响及其封禁停牧后草地植被的自然恢复过程,我们于1992—2006年在科尔沁沙地开展了草地放牧和封育试验,分析研究了人类放牧活动对草地植被的影响,比较了不同程度退化草地恢复速度及其所受气候变化影响。研究结果表明:①在科尔沁沙地,随着放牧强度的增加,草地植被受放牧影响的程度会加重,但只有持续重牧才会导致植被的严重退化,而且持续重牧对植被盖度、高度和草地生产力的危害程度要大于对物种丰富度和多样性的危害程度;中度放牧可以导致植被盖度、高度、生物量的轻度下降,但对物种丰富度、多样性没有不良影响;对于退化草地而言,持续轻牧可促进植被的有效恢复;②封禁停牧以后,草地原受干扰程度不同,其恢复的相对速度也不同,表现为原草地退化越严重,其恢复速度相对越快,而且是植被高度、盖度、生物量的恢复速度要大于物种丰富度、多样性和频度的恢复速度;③草地植被的恢复演替明显受到气候变化的影响,暖湿气候有利于植被的恢复,暖干气候对于植被的恢复不利。

关键词: 科尔沁沙地, 植物群落, 放牧演变, 自然恢复, 过程

Abstract:

To understand the effect of different grazing intensities and enclosure on sandy grassland vegetation in north China, a field grazing and enclosure experiment was conducted from 1992 to 2006 in Horqin Sand Land, Inner Mongolia. The results showed that: ①The grazing effect on grassland vegetation tended to increase with increase of grazing intensity, but only the continual overgrazing could resulted in serious degradation of the grassland vegetation, and continual overgrazing had greater effect on the vegetation height, coverage and biomass than on the species richness and diversity; the moderate grazing had not harmful effect on the species richness and diversity though it could result in light decrease of the coverage, height and biomass; continual light grazing could promote the restoration of the original degradation grassland; ②After enclosure to avoid grazing, the restoration of the vegetation had greater differences among original grasslands with different grazing intensity; the relative faster of vegetation restoration, the severe of vegetation degradation, and the ranges of the restoration was greater in the height, coverage and biomass than in the species richness, diversity and frequency; ③The restoration process was significantly affected by the climate changes, and the warm and wetness climate was propitious to the restoration of degradation vegetation, and the warm and drought climate was not favor to the restoration of degradation vegetation.

Key words: Horqin Sand Land, plant community, grazing, natural restoration, processes

中图分类号:

S812.5

赵哈林;大黑俊哉;李玉霖;左小安;黄刚;周瑞莲. 科尔沁沙质草地植物群落的放牧退化及其自然恢复过程[J]. 中国沙漠, 2009, 29(2): 229-235.

ZHAO Ha-lin;OKURO Toshiya;LI Yu-lin;ZUO Xiao-an;ZHOU Rui-lian. Changes of Plant Community in Grazing and Restoration Processes in Horqin Sand Land, Inner Mongolia[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(2): 229-235.

参考文献

[1]Nautiyal M C,Nautiyal B P,Vinay P.Effect of grazing and climatic changes on alpine vegetation of Tungnath,Garhwal Himalaya,India [J].The Environmentalist,2004(24):125-134.
[2]葛全胜,王芳,陈泮勤,等.全球变化研究进展和趋势[J].地球科学进展,22(4):417-427.
[3]刘国荣,松树奇,刘国良,等.禁牧与放牧管理下典型草地植被变化.内蒙古草业,2006,18(11):17-23.
[4]赵哈林,赵学勇,张铜会,等.科尔沁沙地沙漠化过程及其恢复重建机理[M].北京:海洋出版社,2004.
[5]王德利,吕新龙,罗卫东.不同放牧密度对草原植被特征的影响分析[J].草业学报,1996,5(3):28-33.
[6]董全民,李青云,马玉寿,等.放牧强度对夏季高寒草甸生物量和植被结构的影响[J].青海草业,2002,11(2):8-11.
[7]赵哈林,张铜会,常学礼,等.科尔沁沙质放牧草地植被分异规律的聚类分析[J].中国沙漠,1999,19(增刊1):40-44.
[8]王文颖,王启基.高寒蒿草草甸退化生态系统植物群落结构及物种多样性的分析[J].草业学报,2001,10(3):8-14.
[9]王国宏,任继周.河西山地绿洲荒漠植物多样性研究——放牧扰动下草地多样性的变化[J].草业学报,2002,11(1):31-37.
[10]李霞,李晓兵,王宏,等.气候变化对中国北方温带草原植被的影响[J].北京师范大学学报(自然科学版),2006,42(6):618-624.
[11]李晓兵,陈云浩,张云霞.气候变化对中国北方荒漠草原植被的影响[J].地球科学进展,2002,17(2):254-261.
[12]Schultz P A,Halpert M S.Global analysis of the relationships among a vegetation index,precipitation and land-surface temperature[J].International Journal of Remote Sensing,1995,16:2755-2777.
[13]苏永中, 赵哈林.不同放牧强度后自然恢复的沙质草地土壤性状[J].中国沙漠,2002,22(4):333-337.
[14]王亚军,魏兴琥,杨萍.超载过牧对那曲地区高山嵩草草甸植被退化的影响[J].兰州大学学报（自然科学版）,2005,41(1):32-39.
[15]赵哈林,苏永中,周瑞莲.我国北方沙区退化植被的恢复机理[J].中国沙漠,2006,26(3):323-328.
[16]Cooper A,McCann T,Ballard E.The effects of livestock grazing and recreation on Irish machair grassland vegetation[J].Plant Ecology,2005,181:255-267.
[17]王涛,吴薇,赵哈林,等.沙漠化过程中生物量损失的初步估算[J].中国沙漠,2005,25(4):453-455.
[18]Davenport M L,Nicholson S E.On the relation between rainfall and the normalized difference vegetation index for diverse vegetation types in East Africa[J].International Journal of Remote Sensing,1993(14):2369-2380.
[19]Malo A R,Nicholson S E.A study of rainfall and vegetation dynamics in the African Sahel using normalized difference vegetation index[J].Journal of Arid Environments,1990(19):1-13.