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| Soil sampling methods for evaluation of environmental suitability in organic tea garden based on spatial difference |
| Received:August 04, 2016 |
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| KeyWord:organic tea garden;soil environmental quality;soil sampling;spatial difference |
| Author Name | Affiliation | E-mail | | DU Xia-fei | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZONG Liang-gang | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | zonglg@njau.edu.cn | | ZHANG Qi-hui | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | DAI Rong-bo | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | PAN Han-yue | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | YUAN Qiang | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | XI Yun-guan | Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of the People's Republic of China, Nanjing 210042, China | | | WANG Lei | Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of the People's Republic of China, Nanjing 210042, China | |
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| Abstract: |
| In order to promote the development of organic agriculture, improve and standardize the organic certification technology system, a study on soil sampling methods for organic tea garden was carried out. Spatial differences of soil properties, such as organic matter content, heavy metal content and pH were analyzed under varying sampling methods, including depth, sample point layout and sample numbers among five organic tea gardens. The results show that among different depths of soil profile, both organic matter content and pH changed significantly(P<0.05). The pH was lower and organic matter content was higher in 20~30 cm soil layer where most tea roots exist. Recommended sampling depth of tea garden is 30 cm, as it reflects environmental suitability of tea garden soils more objectively. The order of spatial variation coefficient of heavy metals in the tea gardens was as follows:Pb > Hg > Cu > Cr > As. Hg and Pb were from external sources and clustered in 0~10 cm soil layer, accounting 49.52% and 61.56% respectively. At the range of different altitudes, soil of slope crest possess higher organic matter content and lower pH value. Soil indexes changed significantly(P<0.05) by different sampling densities.It is recommended to use area sampling and increase sample numbers in order to solve the problem caused by spatial difference in tea garden soils. |
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