2) cropland of purple soil
紫色土旱坡地
3) the purple soil region
紫色土地区
1.
According to the aggravation status of water loss and soil erosion in the purple soil region,the authors took Hemingguan watershed of Nanbu county in Sichuan province as study region and investigated the watershed runoff characteristic of the watershed.
针对日益加剧的四川紫色土地区水土流失情况,选取四川省南部县鹤鸣观小流域为研究区,对其径流特征进行探讨分析。
4) purple soil sloping field
紫色土坡地
1.
Soil erosion is a main factor of soil degradation of purple soil sloping field in the Three Gorges reservoir area,and therefore leads to soil coarseness and acidification.
土壤侵蚀是三峡库区紫色土坡地土壤退化的主因,并由此造成土壤粗骨沙化和酸化。
2.
Soil erosion is a main factor of soil degradation of purple soil sloping field in the Three Gorges reservoir area,and therefore it leads to impoverishment of soil nutrient.
土壤侵蚀是三峡库区紫色土坡地土壤退化及土壤养分贫瘠化的主因。
5) slope cropland in purple soil
紫色土坡耕地
1.
A field experiment was carried out in hilly area of central Sichuan Basin to study the characteristics of phosphorus loss by runoff from slope cropland in purple soil.
通过对川中丘陵不同施肥试验田径流、泥沙和磷素流失的观测与测定分析,研究了暴雨下平衡施肥对紫色土坡耕地水土流失与土壤磷素随径流流失的特征。
补充资料：紫色土
| 紫色土 purplish soil 发育于亚热带地区石灰性紫色砂页岩母质土壤。全剖面呈均一的紫色或紫红色，层次不明显。主要分布在中国的亚热带地区，以四川盆地为主。紫色土是在频繁的风化作用和侵蚀作用下形成的，其过程特点是：物理风化强烈、化学风化微弱、石灰开始淋溶。紫色土土层浅薄，通常不到50厘米，超过1米者甚少。一般含碳酸钙，呈中性或微碱性反应。有机质含量低，磷、钾丰富。由于紫色土母岩松疏，易于崩解，矿质养分含量丰富，肥力较高，是中国南方重要旱作土壤之一，除丘陵顶部或陡坡岩坎外，均已开垦种植。因侵蚀和干旱缺水现象时有发生，利用时需修建梯田和蓄水池，开发灌溉水源。开辟肥源以增加土壤有机质和氮的含量，也是提高其生产力的重要措施。
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