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我省旱田面积较大,约占总耕地面积的31%.这些旱田大多分布在平岗、低丘、半高山和高山的山麓缓坡地带,坡度从几度到几十度不等.由于开垦和耕种不合理,水土流失严重,导致土层浅薄,地力瘠瘦,作物单产水平很低.还有不少地区,在坡度较大的地方毁林开荒,水土流失更为严重.为了合理利用坡地旱田并培肥其地力,我们于1982—1984年研究了不同坡度的山地旱田的水土流失情况,作为制订湘西山地旱田水土保持工程技术措施的科学依据.一、试验设置与研究方法在洞口县邵阳地区茶场选择了坡度为4°38’,12°24’,20°12’等低、中、高三种不同坡度的旱田,每个坡度中设梯田平种、等高耕种和顺坡耕种等三种不同耕种方式,共计9个处理.小区长12.3米,宽5.5米,
The area of dryland in our province is larger, accounting for about 31% of the total cultivated area.These drylands are mostly distributed in the gentle slopes of flat hills, low hills, semi-alpine and alpine slopes ranging from several degrees to tens of degrees.Because of reclamation and Irrational farming and serious soil erosion, resulting in shallow soil, poor land fertility and low crop yields, there are still many areas where land reclamation has been deforested in areas with large slopes and soil and water loss become more serious. And fertilize their fertility, we studied the water and soil loss in dryland in different slopes in 1982-1984 as the scientific basis for formulating the technical measures for soil and water conservation engineering in mountainous and mountainous areas of western Hunan. (1) The experimental setup and research methods were carried out in Shaoyang, Dongkou County In the tea plantation, there are three different types of dry land with low, medium and high slopes of 4 ° 38 ’, 12 ° 24’ and 20 ° 12 ’, with three types of terraces, elite and downslope cultivars in each grade Tillage methods, a total of 9 processing small area of 12.3 meters, 5.5 meters wide,