黄土丘陵区纸坊沟流域60年来土地利用格局变化研究
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F301.2

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中国科学院"西部之光"人才培养计划项目(B22012900);中国科学院知识创新工程重要方向项目(KZCX3-SW-421);国家自然科学基金项目(40301029)


Changes in Land Use Patterns in Small Catchment in Past 60 Years in Loess Hilly Region on Loess Plateau
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    摘要:

    以黄土丘陵区纸坊沟流域为研究区,对其60年来的土地利用格局变化进行系统的分析研究,结果表明,土地利用格局变化与人类活动密切相关。农业用地的扩张,是导致林草植被破坏和土地利用格局变化的重要原因。从1938~1958年,坡耕地在土地利用格局中的优势度由低到高,而林草植被的优势度则降至最低点。之后,林草植被随着坡耕地的变化经历了缓慢变化期(1958~1973年)和较快增长期(1973年后)。其中1958年和1995年,是土地利用格局的质变点,也是生态环境变化的重要转折点。而景观形状复杂性变化的转折与景观基质基本一致;景观多样性指数1938年和1958年基本相近,1975年以后,多样性指数逐渐增大,至1995年达到最大值,之后有所降低;由一个利用类型支配(1938年和1958年)的土地利用格局逐渐演变为多个利用类型共同支配的土地利用格局。

    Abstract:

    The changes in land use patterns of Zhifanggou Catchment located in loess hilly region on the Loess plateau were studied using land use maps (1: 7000) derived from the aerial photos and field survey data. The re- sults showed that changes in land use pattern are closely related to human activities. The expansion of agricultural land use was the main reason for the destruction of vegetation and land use pattern change. From 1938 to 1958, the dominance index of vegetation decreased from 55. 94% to 0. 44% while the dominance index of slopping farm- land increased from 12. 65 % to 56. 05 %. After 1958, the vegetation restoration had seen a very slow period (from 1958 to 1973) and a rapid period (after 1973 ) with the changes in agricultural land uses. During this pro- cess, there are two critical points, 1958 and 1995, marked fundamental change of the landscape matrix as well as ecological environment. The study also showed that the landscape shape index was closely related to the intensity of human disturbance; the landscape diversity index was similar in 1938 and 1958, and increased gradually from l975 , and reached the highest level in 1995, then decreased again due to the conversion of slopping farmland to forest and grass. The land use pattern dominated by one land use type has been changed to a new one dominated by several land use types, mainly resulted from comprehensive management carried out in this catchment since 1973.

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温仲明 焦峰 张晓萍 杨勤科.黄土丘陵区纸坊沟流域60年来土地利用格局变化研究[J].水土保持学报,2004,(5):125~128,133

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