| The spatio-temporal variability of soil av ailable nutrients in the Guanzhong plain |
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| DOI：10.7606/j.issn.1000-7601.2009.01.13 |
| Key Words: available nutrient spatio-temporal variability wheat field |
| 作者 | 单位 | | 徐海 | College of Resources and Enw ironment, Northwest A & F Uniwersity，Y angling，Shaanxi 712100, China | | 王益权 | College of Resources and Enw ironment, Northwest A & F Uniwersity，Y angling，Shaanxi 712100, China | | 刘军 | College of Resources and Enw ironment, Northwest A & F Uniwersity，Y angling，Shaanxi 712100, China | | 王芳 | College of Resources and Enw ironment, Northwest A & F Uniwersity，Y angling，Shaanxi 712100, China | | 秦宝军 | College of Resources and Enw ironment, Northwest A & F Uniwersity，Y angling，Shaanxi 712100, China |
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| Abstract: |
| To investigate the dy namic variety disciplinarian of the main soil nutrients in the Guanz hong plain，and to prove up its spatio temporal validity ，in the condition of the accurate spatio temporal scale， a field experiment w as conducted to st udy the spat io temporal v ariability of soil nitrate nit rogen, alkali-hydrolyzable ni trogen, av ailable phosphorus and av ailable potassium of the wheat fields (0~ 100 cm soil layers) in the w hole. growth stage in the Guanzhong plain. The results show ed that the gradient of spatial distribution of the soil ni-trate nitrogen in 0~ 100 cm soil layers w as more significant than that of temporal distribution. And the soil ni-trate nitrogen in 30~ 40 cm soil layers reached cumulative peak and it deleted fast from 90th to 150th during the growth stage. It was found that the content of the soil alkali-hydrolyzable nitrogen w as in binary variability structure in 0~ 100 cm soil layers, and the gradient of its spatial distribution in 0~ 40 cm soil layers w as more significant than that of temporal distribution, but it w as opposite below 40 cm. The gradient of spatial distribu-tion of the soil available P w as more significant than that of temporal dist ribution. And the depletion layer w ent deeper as the w heat grew. It was also found that the gradient of temporal distribution of soil available K was more significant than that of spatial dist ribution, and its content decreased by about 50 mg/ kg every layer during the growth stage. |
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