1) purple soil degradation
紫色土退化
1.
Based on classification and gradation of the degraded purple soils according to the Index System to Evaluate the Purple Soil Degradation in Sichuan Province,the present situation of the purple soil degradation was assessed.
防治紫色土退化的措施有:重建紫色土生态保护系统,改土培肥以增强土壤“体质”和实施保护性耕作等。
2) Ultraviolet degeneration
紫外退化
3) purple soil
紫色土
1.
Competitive sorp-desorption of zinc and cadmium in purple soil;
锌、镉在紫色土中的竞争吸附
2.
Response of sediment flow behavior to storm type and spatial scale in purple soil watershed;
紫色土区小流域泥沙输出过程对雨型和空间尺度的响应
3.
Characteristics of runoff generation and its numerical simulation of surface flow in hilly area with purple soil under convetional tillage systems;
四川丘陵区常规耕作制下紫色土径流发生特征及其表面流数值模拟
4) Purplish soil
紫色土
1.
Purplish soil is one of the most important types of soil in China and readily erodible.
通过模拟降雨试验,探讨了紫色土表土结皮的发育特征。
2.
The Minjiang River,running through the Sichuan Basin as a key tributary to the Yangtze River,is characterized dominantly with purplish soil distribution that is very important for the agriculture along its middle and lower reaches.
以岷江中下游流域紫色土为研究对象,按流域分上中下游区段3个抽样层采样,研究不同土地利用方式下紫色土有机碳储量特征,为紫色土退化评估及地力维护提供参考。
3.
A preliminary study was made of the granular structure and fertility of purplish soils and their relationship under different land use modes.
通过对不同利用方式下紫色土团粒结构、肥力状况及相互关系进行初步研究,结果表明:>5 mm水稳定性团聚体含量顺序为:林草地>林地>耕地>菜地>草地>柑桔园地>梨园地;>0。
6) purple soils
紫色土
1.
Characteristics and spatial distribution of rock fragments in hilly purple soils of Sichuan Basin;
丘陵紫色土砾石的性质及其空间分布
2.
There are three types of the surface erosion in the small watersheds in the hilly area of purple soils.
紫色土丘陵区小流域地面侵蚀类型主要有面蚀、沟蚀和母质侵蚀三种，本文采用铯－１３７同位素示踪法测算了小流域坡面土壤侵蚀模数的多年平均值；用小区法、径流场法和侵蚀针测法分别测定了相同降雨条件下小流域内面蚀、沟蚀和母质侵蚀的侵蚀模数，进而换算出紫色土丘陵区单元小流域地面侵蚀的多年平均侵蚀模数。
3.
This paper deals with the content of colloidal particle and the clay mineral compositions of the purple soils from Yunnan, Guizhou and Anhui provinces.
对云南、贵州和安徽等地的紫色土无机胶体 (<0 0 0 2mm粘粒 )的含量状况和矿物学组成特征作了初步探讨 ,它们的共同特点是 :紫色土 <0 0 0 2mm胶粒含量均小于贵州的对照土壤———黄壤的胶体含量 ;紫色土含较多 2∶1型黏土矿物和间层型矿物质、含较少的 1∶1型黏土矿物和胶粒中含较多石英。
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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