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土壤有机质的含量与土壤肥力水平是密切相关的,通常在其他条件相同或近似的情况下,在一定含量范围内,有机质的含量与土壤肥力呈正相关。因此,对留茬地和翻耕地块沿盛行风向风沙流结构进行试验观测,分析风蚀物的有机质变化特征,结果表明,这两类农田风蚀物有机质含量在垂直高度上的变化均遵循线性规律变化,随高度增加,风蚀物中有机质含量增加;留茬地在20 cm高度内各集沙点风蚀物有机质特征值(B)均小于1,20~60 cm高度内大于1;翻耕地在各集沙点高度内B均小于1。因此,在河北坝上地区退耕林灌草地和耕地基本各自集中成片分布的情况下,留茬耕作仍是一种防治旱作大田块农田风蚀沙化的有效耕作措施。
Soil organic matter content and soil fertility levels are closely related, usually other conditions under the same or similar circumstances, within a certain range of content, organic matter content and soil fertility were positively correlated. Therefore, the stubble and tillage plots were observed and observed along the prevailing wind and sand flow patterns, and the characteristics of wind erosion were analyzed. The results showed that the vertical variation of organic matter content of wind erosion species in both types of farmland followed the linear rule , With the increase of height, the content of organic matter in the wind erosion was increased. The characteristic value of organic matter (B) of the erosive materials in the litters was less than 1 at 20 cm height in the stubble field and more than 1 in the height of 20-60 cm. Sand point height B are less than 1. Therefore, in the Bashang region of Hebei grassland shrubs and shrubs and grassland are basically concentrated into pieces of distribution, stubble cultivation is still a field of drought control of farmland wind erosion and desertification of effective tillage measures.