| Study on the decline process and instauration path of land productivity on the sloping land in the Southern Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2007.01.02 |
| Key Words: model soil erosion land productivity Loess Plateau |
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| Abstract: |
| Using the PI model this paper simulates the changing trend of the land productivity under the natural process soil conservation and fertilization on the sloping lands in the southern Loess Plateau. The results show as follows：the decline speed of the sloping land productivity under the nature process is very quick the productivity annually reduces averagely by 0.25％ to 0.5％；the decline speed under the soil conservation decreases by 0.07％ （level terrace） 0.15％ （sloping terrace） and 0.21％ （contour plant） compared with the nature erosion；the land productivity get obvious instauration as the measures of soil conservation and fertilizer are applied；The soil conservation measure can decrease the decline speed of the land productivity but can’t effectually recover the productivity；only application of the soil conservation measure along with fertilization can retrieve and enhance the land productivity. |