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دانلود رایکان مقاله انگلیسی ISI با موضوع ارزیابی و تجزیه و تحلیل تغییرات کیفیت خاک پس از یازده سال اصلاح اراضی نیمه گرمسیری چین

عنوان فارسی مقاله:

ارزیابی و تجزیه و تحلیل تغییرات کیفیت خاک پس از یازده سال اصلاح اراضی نیمه گرمسیری چین

عنوان انگلیسی مقاله:

Assessment and analysis of soil quality changes after eleven years of reclamation in subtropical China

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2. Method for evaluation of soil quality changes

2.1. Study site

This study was conducted at the Qian-Yan-Zhou experimental station of the Chinese Academy of Sciences QYZES . Covering an area of 204.2 ha, QYZES Ž . is located in Taihe county, Jiangxi province, at 1158 57X E, 278 42X N and has a subtropical climate and elevations from 66 to 131.5 m Wang and Gong, 1995 . Ž . The mean annual temperature is 18.68C with an annual precipitation of about 1360 mm and 1785 hours sunshine. The relief is dominated by hills. According to the Chinese Soil Taxonomic Classification First Proposal , the soils are Ž . classified into four soil groups and fifty species. The four soil groups are Red soils, Paddy soils PS , Meadow soils MS , and Umbrihumus Meadow soils Ž. Ž . Ž . US . This approximately corresponds to the Haplic Acrisols, Aric Anthrosols, Eutric Fluvisols, and Umbric Fluvisols, respectively, in the FAO-UNESICO WORLD MAP Revised Legend. According to the soil parent materials, the Red soils are differentiated Argillaceous Red soils AS and Sandstone Red soils Ž . Ž . SS . Table 1 shows some properties of the major soils. Before 1983, QYZES was a very poor village with a lack of water and forest, poor soils, low yields, and extensive wasteland. In 1983, QYZES was provided with a detailed soil survey by the Chinese Academy of Sciences, and many important background data were obtained. It was then reclaimed under scientific guidance. In 1994, land utilization rate increased to 95% from the 10% in 1983. There are now more than 20 land use patterns including cropland, orchard land, forest land, shrubby land, pastureland, grassland, and bare land, which have been managed using common local measures and practices Cheng, 1993 . This Ž . provided a unique precondition for this study.