| Stoichiometry and steady\|state characteristics of plant\|soil carbon, nitrogen and phosphorus under water regulation of spring wheat in loess hilly region |
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| DOI：10.7606/j.issn.1000-7601.2022.01.21 |
| Key Words: spring wheat irrigation water soil organic carbon total nitrogen total phosphorus stoichiometric characteristics homeostasis |
| Author Name | Affiliation | | XIE Mingjun | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Guang | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YAN Lijuan | Agricultural College, Gansu Agricultural University, Lanzhou,Gansu 730070, China | | YUAN Jianyu | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LIU Shuainan | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | QI Xiaoping | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHANG Haigang | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To explore the soil nutrient limitation and its circulation in the farmland ecosystem and clarify the homeostasis characteristics of spring wheat, the leaves, roots and soil of 0~40 cm in the mature stage of spring wheat were studied under 5 irrigation treatments (W0, W50, W100, W150 and W200) in loess hilly area. The contents and stoichiometric ratios of organic carbon (OC), total nitrogen (TN) and total phosphorus (TP) in spring wheat leaves, roots and soil under different irrigation treatments were measured to determine the steady\|state characteristics of spring wheat leaves and roots with soil nutrients.The results showed that: (1)The contents of OC and TN in spring wheat soil under different irrigation treatments had the characteristics of surface aggregation and in 0~40 cm soil layer. The content increased first and then decreased with the increase of irrigation amount, and W150 irrigation amount was the highest （1.757 g·kg-1, 0.165 g·kg-1）. The soil TP was relatively stable under soil layer and irrigation treatment.Our research also showed the proper irrigation (W150) was helpful to increase the nutrient content of OC in crop roots.However excessive irrigation (W200) reduced the nutrient content. (2) The average stoichiometric ratios of soil, roots, and leaves were: C∶N (9.56, 12.92, 15.086), C∶P (11.68, 79.66, 151.625), N∶P (1.264, 7.577, 11.903). The soil C∶N value was relatively stable under the soil layer and irrigation treatment. The C∶N and C∶P values of spring wheat leaves were lower than the global average (16.27, 595). The N∶P values of spring wheat leaves (11.903) and roots (7.577) were both less than 14 （critical value）. (3) In the relationship between spring wheat and soil C, N, P and their stoichiometry, leaf and root had relatively stable internal stability.In conclusion, spring wheat plants were mainly limited by N, and the selection of appropriate irrigation treatment was conducive to the retention of crop soil nutrients and effective restoration of crop ecosystem. |
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