河北省草地资源评价

Grade appraisement of grassland resource in Hebei Province

为掌握河北省草地资源动态,于2005-2007年进行了草地资源调查,根据草地植被产量、适口性及利用性状分析结果进行了草地等级评价。结果表明,1）Ⅰ、Ⅱ、Ⅲ、Ⅳ和Ⅴ等草地占调查样地的比例分别为0.91%、13.64%、31.82%、30.91%和22.73%。总体来看,Ⅲ、Ⅳ等草地所占的比例较大,占调查样地的62.73%。不同草地类差异较大,温性草原、暖性草丛基本属于Ⅲ、Ⅳ等草地;温性草甸和山地草甸基本属于Ⅲ、Ⅳ、Ⅴ等草地;暖性灌草丛、低地草甸以Ⅳ、Ⅴ等草地为主;沼泽草地为Ⅳ等草地。2）1~8级草地占调查样地的比例分别为7.27%、4.55%、11.82%、15.45%、27.27%、14.55%、10.91%和8.18%。3）与20世纪80年代河北省草地等级评价结果相比,Ⅰ、Ⅱ等草地的比例下降,Ⅲ、Ⅳ、Ⅴ等草地比例上升;1~4级草地比例降低,5~8级草地比例升高,草地整体呈恶化趋势。

In order to achieve the dynamic state of grassland resources in Hebei Province,the data of open-air grassland survey of 110 plots,330 quadrats were obtained from 2005 to 2007.Based on grassland vegetation yield,palatability and utilization characters,the rangeland grades in Hebei Province were appraised.Results from this study indicated that： 1） The percentages of grade Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴin the investigated grassland plots were 0.91%,13.64%,31.82%,30.91% and 22.73% respectively.The proportion of grades Ⅲ and Ⅳ,total 67.73% in the investigated grassland plots,was bigger than that of others.Different grassland types had significant different grassland grades.The temperate steppe and warm temperate tussock could be classified into grade Ⅲ and Ⅳ;the temperate meadow and mountain meadow belonged to grade Ⅲ,Ⅳand Ⅴ;the warm temperate shrub-grassland and lowland meadow were grade Ⅳand Ⅴ;and the land marsh grassland were put into grade Ⅳ.2） The proportion of grassland classified into level 1 to 8 was 7.27%、4.55 %、11.82 %、15.45%、27.27%、14.55%、10.91% and 8.18% respectively.3）Comparison with the appraisement results of grassland grades in the 1980s,the proportion of gradeⅠandⅡgrassland decreased;grade Ⅲ,Ⅳ andⅤ increased;the proportion of level 1 to 4 reduced,level 5 to 8 elevated;overall grassland resources in Hebei Province showed an worsening trend.