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锡林河流域草地现状及冷季载畜量研究
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摘要
我国是草地资源大国。草地畜牧业是我国畜牧业不可或缺的组成部分。加强草地保护建设是增加牧民收入、促进牧区繁荣和边疆稳定的需要;是建设现代化畜牧业和维护国家生态安全的需要。目前草地的突出问题是草地畜牧业发展与草地生产能力不协调,草地生态退化面积迅速扩大,严重影响草地畜牧业的可持续发展和牧区经济社会的稳定和发展。采取有效措施,缓解季节性草畜矛盾,从根本上扭转草地生态退化的局面,促进草地畜牧业的可持续发展,具有十分重要的意义。
     本文以内蒙古锡林河流域为研究区,通过野外定点实际调查,结合遥感与地理信息系统技术,分析锡林河流域草地植被现状、不同植被指数与草地生物量之间的相关关系,并结合目前当地畜牧业发展现状,对该地区的冷季载畜量进行评价。初步得出以下结论:
     1.研究区的草原植被主要包括贝加尔针茅(Stipa baicalensis)、羊草(Leymuschinensis)、大针茅(stipa grandis)、克氏针茅(Stipa krylovii)、糙隐子草(Cleistogenes spuarrosa)、冷蒿(Artemisia frigida)6个群落。根据利用强度,研究区的草原植被可归结为轻度退化、中度退化、重度退化三个等级。研究区草原退化率与冷季超载率之间有线性关系(R~2=0.6804),这进一步说明了季节性超载放牧是草原退化的主要原因。
     2.研究区遥感植被指数与草地生物量之间存在着较好的相关性。但是,不同植被指数与草地生物量的相关性也存在一定差别,其中,ARVI的相关性最高,相关系数达到0.881,其次为MSAVI、TVI、NDVI、SAVI、Ⅱ,RVI和草地生物量的相关性最低(R=0.667)。通过不同植被指数与草地生物量之间的回归分析证明,S曲线是最适用于研究区的非线性模型。
     3.研究区牧业产值占农牧业总产值的74.9%,人均牧业收入占当年人均总收入的84.6%。这充分反应了草地畜牧业在牧区经济发展中的重要地位。伊利勒特、达布希勒特、罕乌拉苏木的牲畜存栏数逐年小幅度增长,出栏数有下降趋势,使冷季草畜矛盾更加突出;而朝格乌拉和巴彦宝拉格苏木的牲畜存栏数呈下降趋势,出栏数有增加趋势,可以缓解冷季草畜矛盾。但不同苏木之间的出栏率无显著差异(P>0.05)。
     4.2004年研究区冷季载畜量评价结果表明,朝格乌拉、巴彦宝拉格、伊利勒特、城关苏木的草地产草量总体上完全可以满足目前冷季牲畜的需求量,但区域性超载严重。达布希勒特、罕乌拉苏木和巴彦锡勒牧场的草地产草量满足不了冷季牲畜需求量,超载严重,使冷季草畜矛盾更加突出。
China is a country with abundant grassland resources. Grassland livestock is a main component of the livestock in China. It essential to protect and improve the grassland resources for the purposes of increasing the income of ranchers, promoting the prosperity of pasturing areas, stabilizing and safeguarding border regions, building up a modern agriculture and maintaining a safe ecological environment.
     The main problems facing the pasturing areas are the imbalance between the development of grassland livestock and the productivity of grassland, which results in the continuing worsening of the ecology in pasturing areas. The sustainable development and stabilization in pasturing areas are threatened by the deteriorating of the grassland. It is of great importance to take effective measures to alleviate the seasonal contradiction between grass and livestock, to inverse the trend of grassland deterioration and promote the sustainable development in pasturing areas fundamentally.
     In this article we take Xilin river basin of Inner Mongolia as our research area, With the aid of open country fixed point actual investigation、remote sensing and geographic information system technology, we analysis the present situation of Xilin river basin grassland vegetation, correlation between different vegetation index and grassland biomass, carries on appraisal to cool-season stocking capacity based on the present development situation of livestock in local area, and finally we preliminarily get the following conclusions:
     1. The typical steppe vegetation in the research area include 6 formations: Stipa baicalensis, Leymus chinensis, Stipa grandis, Stipa krylovii, Artemisia frigida, Cleistogenes spuarrosa. According to the using intensity, the steppe vegetation in the research area can be attributed to moderate, mild and heavy three degraded grades. There has a Linear relation between research area steppe degeneration rate and cool-season overload rate (R~2=0.6804) ,This further Indicates that the main reason of steppe degeneration is seasonal overload stocking.
     2. There has a better relevance relation between the remote sensing vegetation index and grassland biomass of the research area. But relevance between different vegetation index and grassland biomass also has certain difference. Among them, the relevance of ARⅥis highest, Correlation coefficient reaches to 0.881, follows by MSAⅥ, TVI, NDⅥ, SAⅥ,Ⅱ, the relevance between RⅥand grassland biomass is Lowest (R=0.667) . Through regression analysis between different vegetation index and grassland biomass we can find S curve is the most suitable non-linear model for the research area.
     3. Livestock output value of the research area accounts for 74.9% of total agriculture and herd output value, the rancher's average livestock income accounted for 84.6% of total average livestock income in the same year. This fully reflects the important status of grassland livestock in the pastoral area economy development. in Yilalt、Dabxilte、HanWuul, amount of livestock is slightly growing year by year, amount of livestock take-off has the dropping tendency. It makes the contradiction between grass and livestock more prominent in the cool-season. However, in ChogWuul and BayanBulag amount of livestock has the dropping tendency, while amount of livestock take-off has the rising tendency. It can alleviate the contradiction between grass and livestock in the cool-season. But there has no remarkable difference in the rate of outing fence among different townships (P > 0.05 ).
     4.The appraisal result of cold-season stocking capacity at research area in 2004 indicates that the productivity of grassland in these areas such as ChogWuul、BayanBulag、Yilalt、Chengguan can definitely satisfy present demand in the overall,But the regional overload is serious. productivity of grassland in Dabxilt、HanWuul and BayanXil can't satisfy the demand of cold-season stocking capacity, cold-season overload is serious. It makes the contradiction between grass and livestock more prominent in the cool-season.
引文
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