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Research on Regionalization of Soil and Water Conservation Tillage Measures in Loess Plateau Region

Author: LiuYuLan
Tutor: MuXingMin；WangFei
School: Northwest University of Science and Technology
Course: Soil and Water Conservation and Desertification Combating
Keywords: loess plateau region soil and water conservation tillage measures cropping system regionalization obstacle factors of agricultural production
CLC: S157.4
Type: Master's thesis
Year: 2009
Downloads: 61
Quote: 2
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Abstract


Loess plateau region is the important dry-farming agricultural area in the northern part of China, but soil and water loss during the process of agricultural production in this area is greatly serious. Therefore, research of soil and water conservation measures is needed based on the study of the cropping system and cropping system regionalization. At the present stage, soil and water conservation engineering measures and biological measures in loess plateau region have been investigated, however, the study and investigation of soil and water conservation tillage measures is relatively less. In this paper, a database based on the data by consulting materials related to agricultural regionalization and field investigation was established. After the determination of regionalization principle and index system, the cropping system regionalization was conducted with the theory of agricultural regionalization as the guide. According to that, the obstacle factors of agricultural production and the classification of surface slopes in each zone were analyzed. What’s more, the suitable conditions of the main soil and water conservation tillage measures in loess plateau region were analyzed, and the deployment of soil and water conservation tillage measures in each zone was proposed in order to provide scientific foundation for controlling soil and water loss and guiding the agricultural production in loess plateau region in the light of local conditions.The main results were as follows:(1) Principles of cropping system regionalization in loess plateau region were proposed.Cropping system regionalization is a kind of agricultural regionalization. According to the full realization of the actual situation of agricultural production in loess plateau region and the general principle of agricultural regionalization, the principles in this paper were determined to be zonality and azonality principle, comprehensive principle and leading principle, regional conjugacy principle, the principle of tillage measures suitability, and the principle of keeping the relative integrity of administration cell at the county level.(2) Indexes of cropping system regionalization in loess plateau region were proposed.Under guidance of regionalization principle, the regionalization indexes in this research were determined by comprehensively considering the effects of natural conditions and social-economic conditions on cropping system in loess plateau region. When≥0℃accumulated temperature was less than 4000℃, it was the zone with single crop annually; when≥0℃accumulated temperature was more than 4000℃, it was the zone with double crops annually. The cropping system regionalization was divided by comprehensively considering administration location, landform, the condition of drying and wetting and cropping system.(3) The cropping system regionalization in loess plateau region was made.According to the existing research achievements of cropping system regionalization and the agricultural regionalization of each province in loess plateau region, the whole loess plateau region was divided into ten different zones: semi-humid zone with single crop or double crops annually in Fen-wei Plains(Ⅰ) , dry-farming loess hilly zone with single crop annually in Shaanxi, Gansu, Ningxia and Shanxi(Ⅱ), semi-humid mountainous zone with single crop annually in East Shanxi(Ⅲ), dry-farming mountainous zone with single crop annually in North Shanxi Highland(Ⅳ), semi-humid hilly zone with single crop or double crops annually in West Henan(Ⅴ), dry-farming loess gulled-hilly zone with single crop annually in Shaanxi, Gansu and Shanxi(Ⅵ), dry-farming hilly zone with single crop annually in Lanzhou(Ⅶ), dry-farming hilly zone with one single crop annually in East Qinghai(Ⅷ), irrigation zone with single crop annually in Hetao Plain and Yinchuan Plain(Ⅸ), semi-arid zone with single crop annually in Ordos Plateau(Ⅹ).(4) The suitable condition of the main soil and water conservation tillage measures in loess plateau region and its deployment situation in each zoneOn the basis of the cropping system regionalization in loess plateau region, the main soil and water conservation tillage measures were selected, and the suitable conditions of each tillage measure were determined. What’s more, the obstacle factors of agricultural production and classification condition of surface slope in each zone were analyzed and summarized. Finally, according to the local natural conditions, the deployment suggestion of the soil and water conservation tillage measures in each zone was proposed, and the characteristics of each zone were summarized systematically.The selected soil and water conservation tillage measures were contour tillage, furrow and ridge tillage, level trench, intercropping, interplanting, plastic film mulching and conservation tillage. Contour tillage was suitable to the 3～15°slope land, furrow and ridge tillage was suitable to the <3°flatland, level furrow was suitable to 15~25°slope land, intercropping was suitable to the area in which≥10℃accumulated temperature was less than 2600℃, interplanting was suitable to the area in which≥10℃accumulated temperature was between 2600 and 4000℃, plastic film mulching was suitable to the flat dryland of arid planting area in semi-arid region and the cool area with high altitude or high latitude, and the conservation tillage was almost suitable to any area.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil and Water Conservation > Agricultural technical measures
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