CAJ | 학술논문

　　依托陕西长武农田生态系统国家野外科学观测研究站十里铺长期定位观测，研究了5种不同氮肥用量（0、45、90、135、180 kg?hm-2）对冬小麦农田土壤水分及土壤干层动态的影响。结果表明：土壤干层深度大约在50～260 cm之间；施氮量小于90 kg?hm-2时，增施氮肥土壤耗水强度和干层深度变化较小，而施氮量超过90 kg?hm-2时，增施氮肥平均土壤耗水强度较大，但干层深度无明显变化，干层厚度增加速度随施氮量增加而增加；丰水年的高降水量在一定程度上可以缓解土壤干燥化，减小干层厚度。
　　의탁협서장무농전생태계통국가야외과학관측연구참십리포장기정위관측，연구료5충불동담비용량（0、45、90、135、180 kg?hm-2）대동소맥농전토양수분급토양간층동태적영향。결과표명：토양간층심도대약재50～260 cm지간；시담량소우90 kg?hm-2시，증시담비토양모수강도화간층심도변화교소，이시담량초과90 kg?hm-2시，증시담비평균토양모수강도교대，단간층심도무명현변화，간층후도증가속도수시담량증가이증가；봉수년적고강수량재일정정도상가이완해토양간조화，감소간층후도。
Basing on the long -term observation data in Changwu County ,Shaanxi Provinve ,the influence of dif-ferent nitrogen rates (0 ,45 ,90 ,135 ,180 kg?hm-2 ) on soil moisture and evolution of dry soil layer in field of winter wheat was studied .The results showed that the depth of dry soil layer was approximately in the range of 50~260 cm . When nitrogen rate was less than 90 kg?hm-2 ,the soil water consumption intensity of nitrogen fertilization and the varia-tion of dry layer depth were small ;when nitrogen rate exceeded 90 kg?hm-2 ,the average soil water consumption intensi-ty of nitrogen fertilization became relatively high ,but there was no significant change in dry layer depth .The increase speed of dry layer thickness increased along with the increase of nitrogen rate .The high precipitation in wet years could relieve soil desiccation and reduce dry layer thickness to some extent .