| Spatial variability of total nitrogen, phosphorus, and potassium in soil under different human disturbances |
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| DOI：10.7606/j.issn.1000-7601.2019.01.16 |
| Key Words: TN, TP and TK in soil spatial heterogeneity geostatistics human disturbance area no-human disturbance area |
| Author Name | Affiliation | | LIU Jing-chao | College of Resource and Environment Sciences, Xinjiang University, Laboratory of Oasis Ecology, Ministry of Education, Urumqi, Xinjiang 830046, China | | XIONG Hei-gang | Department of Urban Study, College of Art Science, Beijing Union University, Beijing 100083, China | | HE Dan-dan | College of Resource and Environment Sciences, Xinjiang University, Laboratory of Oasis Ecology, Ministry of Education, Urumqi, Xinjiang 830046, China | | QIAO Juan-feng | College of Resource and Environment Sciences, Xinjiang University, Laboratory of Oasis Ecology, Ministry of Education, Urumqi, Xinjiang 830046, China | | ZHENG Man-di | College of Resource and Environment Sciences, Xinjiang University, Laboratory of Oasis Ecology, Ministry of Education, Urumqi, Xinjiang 830046, China |
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| Abstract: |
| The spatial heterogeneity of soil total nitrogen, phosphorus and potassium in 25 samples from area without human activities and 30 samples from human disturbed area were studied using geostatistics and GIS. The results showed that the land of human-disturbed area was mostly exploited as forest land and nursery field. Due to the removal of vegetation residues by human activity, the source of soil humus was eliminated. For the plowing of the land, the soil was more aerated. As a result, it accelerated the decomposition and utilization of nutrients in soil. So, the average amount of total N, P, and K in the soil decreased to 0.433, 0.902, and 15.325 g·kg-1, the differences and distributions between the datas also varied. The spherical model well modeled the soil total P distribution in the non-man disturbed area. However, the Gaussian model modeled the distribution of the other nutrients in both areas well. The R2 values of models for the two areas were between 0.66 and 0.90, and correlation was high. The theoretical model of total N, P, and K had high R2 but low RSS for the undisturbed area. The land with high total N, P, and K in the undisturbed area had high vegetation coverage. In the area with a high intensity of disturbance, the contents of total N and P in the soil were relatively low, therefore, proper amount of N and P fertilization should be added to meet the plant nutrient requirements. |
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