用逐步判别分析对陇东基本农田建设类型分区的探讨
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INQUISTION OF CONSTRUCTION TYPES OF BASIC FARMLAND REGIONALIZATION BY WAY OF STEPWISE DISCRIMINANT ANALYSIS IN EAST GANSU PROVINCE
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    摘要:

    采用逐步判别分析,探讨了基本农田建设类型分区的方法,其中包括基本原理和模型结构。判别函数的模型是yg(x)=lnqg+Cog+C1gX1+C2gX2+…+CmgXm根据由入选变量组成的判别函数,将甘肃省河东黄土高原分成三个基本农田建设类型区,亦即Ⅰ——陇东黄土高原沟壑埝地、梯田建设区;Ⅱ——陇中南部黄土丘陵沟壑水平梯田建设区;Ⅲ——陇中北部低山宽谷和丘陵沟壑砂田、水地和隔坡梯田建设区。

    Abstract:

    By way of stepwise discriminant analysis,this paper analyses and in- quires into the general method of constructive types of basic farmland re- gionalization,including fundamental ideas and structure of pattern. The model of the discriminent function is YgX)=1nqg+Cog+C1gX1+C2gX2+…+CmgXm in which Cog=-1/2C1gXig;Cig,=(N-G)WigXig,i∈1, g=1,2,.…,G. where Cig—discriminant coefficients; Xi—varibles; qg—a priority probability; N—number of samples; G—number of regionalization; 1—selected variables. According to the discriminant function comprising the selectedfactors, Gansu Province over the Loess Plateau in the east of the Huanghe Riveris divided into three constructive type regions of basic farmland,that is Ⅰ—constructive broad striped level field and level terrace region in the gully Loess Plateau region of east Gansu Province; Ⅱ—constructive level terrace region in the hilly and gully Loess Pla- teau region is of mid-south Gansu Province; Ⅲ—constructive stone mulch culture,irrigated land and alternation of level terrace and slope region in the low-hills and flat plains before the mountains and hilly and gully Loess Plateau is in the north of middle Gansu Province. A constructive types of basic farmland regionalization map is offered in the end.

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蒋定生,黄国俊,范兴科.用逐步判别分析对陇东基本农田建设类型分区的探讨[J].水土保持通报,1987,(2):7-16

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  • 在线发布日期: 2014-12-01
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