干旱地区农业研究2017，Vol.35Issue(4)：22-27,73,7.DOI:10.7606/j.issn.1000-7601.2017.04.04
盐碱地不同施氮量对土壤微生物区系与食葵产量的影响
Effects of nitrogen fertilizer application rate on soil microflora and sunflower yield in saline-alkali soil
摘要
Abstract
In order to form a solid basis for an effective fertilization mode in saline-alkali soils,a field experiment was conducted to determine the effects of different levels of nitrogen on soil microoganisms and sunflower yield in Hetao Irrigation District in Inner Mongolia.Six treatments were designed including five nitrogen fertilizer levels,viz.,75 kg·hm-2(N1),150 kg· hm-2(N2),225 kg· hm-2(N3),300 kg· hm-2(N4),375 kg· hm-2 (N5) and a control (CK).The results indicated that:(1) Applying nitrogen fertilizer could significantly increase the number of microorganisms and the diversity of flora in the root zone.The order of soil microorganisms at 0 ～ 20 cm soil depth arranged was N4 ＞ N3 ＞ N5 ＞ N2 ＞ N1 ＞ CK.(2) Applying nitrogen fertilizer could promote the growing and development of sunflower as well as yield.The growth vigor and dry matter of sunflower increased gradually and yield varied parabohcally with nitrogen application rates.Therefore,the yield of five nitrogen fertilizer levels treatments were higher than CK by 0.06％,36.27％,61.95％,105.36％ and 85.03％,respectively.(3) Appropriate nitrogen application rate could reduce soil salinity of 0 ～ 40 cm depth.After harvest,the order of salt accumulation arranged was N2 ＞ CK ＞ N5 ＞ N3 ＞ N1 ＞ N4.(4) There is a significant positive correlation between the numbers of soil microorganisms,advantage bacteria flora and nitrogen application,root dry matter.However,there is a significant negative correlation between the numbers of soil microorganisms,advantage bacteria flora and soil salt content,salt accumulation.In summary,the appropriate nitrogen application rate is 300 kg·hm-2 for sunflower on the moderate saline-alkali soils in Hetao Irrigation District in Inner Mongolia.关键词
氮肥/盐碱土/食葵/土壤微生物/微生物区系Key words
nitrogen fertilizer/saline soil/sunflower/soil microorganism/microbial flora分类
农业科技引用本文复制引用
张珺穜,王婧,张莉,逄焕成,张建丽,李二珍,靳存旺..盐碱地不同施氮量对土壤微生物区系与食葵产量的影响[J].干旱地区农业研究,2017,35(4):22-27,73,7.基金项目
国家自然科学基金(41501314) （41501314）
公益性行业(农业)科研专项(201303130) （农业）
