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| 科尔沁沙地自然与人为因素对沙漠化影响的累加效应分析 | |
| 引用本文： | 常学礼,赵学勇,韩珍喜,崔步礼,陈雅琳.科尔沁沙地自然与人为因素对沙漠化影响的累加效应分析[J].中国沙漠,2005,25(4):466-471. |
| 作者姓名： | 常学礼 赵学勇 韩珍喜 崔步礼 陈雅琳 |
| 作者单位： | 1. 鲁东大学,地理与资源管理学院,山东,烟台,264025 2. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 3. 内蒙古自治区赤峰市林业局,内蒙古,赤峰市,024000 |
| 摘 要： | 采用滑动平均法分析了科尔沁沙地年平均温度、年降水量(代表自然因素)和耕地指数、草场载畜量(代表人为因素)对沙漠化影响的累加效应。结果表明,年平均温度和年降水量的累加作用持续的时间较短(在4a之内),其中年平均温度对沙漠化影响的累加效应作用在2a最大,但作用不明显;年降水量对沙漠化的影响以4a最高,累加效应最明显,关联系数为0.801,而且二者之间有较显著的回归关系。年降水量和年平均温度的波动特点是决定累加作用时间和影响强度的关键。代表人为因素的耕地指数和草场载畜量对沙漠化影响的累加效应都比较明显、作用持续的时间较长(大于8a),其中耕地指数对沙漠化的影响以7a的累加效应最明显;草场载畜量对沙漠化的影响以10a的累加效应最明显,耕地指数和草场载畜量与沙漠化之间存在着较显著的回归关系。人口持续增长导致的对资源环境压力的增大是耕地指数和草场载畜量对沙漠化影响产生累加效应的根本原因。 |
| 关 键 词： | 自然因素 人为因素 累加效应 沙漠化 科尔沁沙地 |
| 文章编号： | 1000-694X(2005)04-0466-06 |
| 修稿时间： | 2004年3月18日 |
Cumulative Impacts of Human Activities and Natural Elements on Desertification in Horqin Sand Land |
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| CHANG Xue-li,ZHAO Xue-yong,HAN Zhen-xi,CUI Bu-li,CHEN Ya-lin.Cumulative Impacts of Human Activities and Natural Elements on Desertification in Horqin Sand Land[J].Journal of Desert Research,2005,25(4):466-471. | |
| Authors: | CHANG Xue-li ZHAO Xue-yong HAN Zhen-xi CUI Bu-li CHEN Ya-lin |
| Institution: | CHANG Xue-li~1,ZHAO Xue-yong~2,HAN Zhen-xi~ |
| Abstract: | Analyses of the data of annual air temperature, annual precipitation (identified as natural element), and cropland index and grassland carrying capacity (as human activity), with sliding average, found that the duration of cumulative impacts of annual mean air temperature and precipitation on desertification is short, generally not over four years and the effect of annual mean temperature on desertification is not significant and came to the maximum in the second year; that of precipitation on desertification is significant and reached the maximum in the fourth year with r=0.801, showing a strong correlation between these two parameters. The variation of air mean temperature and annual precipitation played a key role in the duration and intensity of cumulative impacts on desertification. Human activities, i.e. cropland index and carrying capacity of grassland imposed significant impacts on desertification in a longer time period, generally more than 8 years. The cropland index showed the most significant cumulative impacts on desertification in the seventh year while that of the carrying capacity on desertification came to a maximum in the tenth. There is a close relationship between desertification, and cropland index and carrying capacity. The root cause of the cumulative impacts of cropland index and carrying capacity on desertification is the increasing pressure on environment and resource due to increasing population. |
| Keywords: | natural element human activity cumulative impact desertification Horqin Sand Land |
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