• 论文 •

### 红壤丘陵区土地可持续利用中的干旱约束与调控研究

1. 1. 中国科学院南京土壤研究所 南京210008;
2. 南京大学城市与资源学系,南京210093
• 收稿日期:2002-01-04 修回日期:2002-05-30 出版日期:2002-08-15 发布日期:2002-08-15
• 作者简介:周炳中(1959-),男,湖南邵阳人,博士后,副教授。主要从事资源学、环境学研究,已发表论文20 余篇。
• 基金资助:

国家973项目(G1999011801);中国科学院红壤生态站开放研究基金项目(Bb9917)

### Drought restriction and its management in sustainable land use in earth hilly area

ZHOU Bing-zhong1, YANG Hao1, ZHAO Qi-guo1, BAO Hao-sheng2, Zhou Sheng-lu2, Gao Ren1

1. 1. Institute of Soil Science, CAS, Nanjing 210008, China;
2. Department of Resource &|Urban Environment, Nanjing University, Nanjing 210093, China
• Received:2002-01-04 Revised:2002-05-30 Online:2002-08-15 Published:2002-08-15

Abstract:

In view of sustainable land use, the frequencies, characteristics and reasons of drought are studied in red earth hilly area of southern China. The intensity of drought restricting to land use and its temporal and spatial variations, relation between the pattern of land use and the degree of drought as well as measures taken to control drought are dealt with in this paper. Yujiang County of Jiangxi Province was chosen for a case study, the regional drought was assessed by using quantitative methods such as Zi index, coefficient of variation and departure value of precipitation. High frequency and types of drought in the hilly area are distinguished during the period 1951 to 2000. Compared to the case of northern China, the degree of drought was more tiny and alleviated. Drought restricts the three dimensional distribution of landuse and consumably occupies cultivated land resource. Restricting strength index (K) was used to quantify the effect of drought on the restricting degree of agricultural land. Taking a very drought year, the results indicated the K value of the effect of drought on paddy rice is 0.08～0.11, belonging to low restricting strength;that on the dryland is 0.46, high restricting strength; and on farmland for comprehensive evaluation is 0.21, moderate restricting strength. The reasons of drought in red earth hilly area are becauseof the seasonal change of atmosphere circumfluence in eastern China, lower availability in soil moisture,inappropriate human activities and lack of socio-economic ability in combating drought. The regional drought has a high tendency as the human-controlling factors change their condition. Such measures to alleviatethe drought should be taken as follows: (1)including seepage control of dykes several hundred kilometers long in the area, intensification of canalized irrigation networks and development of mini electromechanical irrigation project in hummocks; to perfect irrigation canal system and expand irrigated area by diverting other water resources;(2) to construct small scale water storage ponds in remote and high hummocks; (3) to popularize water-saving agricultural techniques such as intercropping forest and grain plant straw mulching technique, drought-resistant crop(e.g. peanuts)selecting, terracing and scale pitting; (4) to control strictly dryland development in the area and return part of cultivated land to forest on north-south hummocks; and (5) to increase appropriately the ratio of land used for construction and optimize the structure of landuse.