灌溉和施氮对免耕留茬春小麦农田土壤有机碳、全氮和籽粒产量的影响

doi:10.11686/cyxb20130330

草业学报 ›› 2013, Vol. 22 ›› Issue (3): 227-.DOI: 10.11686/cyxb20130330

灌溉和施氮对免耕留茬春小麦农田土壤有机碳、全氮和籽粒产量的影响

俞华林¹,张恩和^1*,王琦^2,3,刘青林¹,刘朝巍¹,王田涛¹,尹辉²

1.甘肃农业大学农学院,甘肃兰州 730070;
2.甘肃农业大学草业学院,甘肃兰州 730070;
3.中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室青藏高原冰冻圈观测试验研究站,甘肃兰州730000

出版日期:2013-06-20 发布日期:2013-06-20
通讯作者: E-mail:zhangeh@gsau.edu.cn
作者简介:yuhl.1123@yahoo.com.cn
基金资助:
“十二五”国家科技支撑计划 (2012BAD14B10)资助。

Effects of irrigation and N supply levels on soil organic carbon, total nitrogen and
grain yield of spring wheat on no-tillage farmland with standing stubble

YU Hua-lin¹, ZHANG En-he¹, WANG Qi^2,3, LIU Qing-lin¹, LIU Chao-wei¹, WANG Tian-tao², YIN Hui²

Effects of irrigation and N supply levels on soil organic carbon, total nitrogen and
grain yield of spring wheat on no-tillage farmland with standing stubble
YU Hua-lin¹, ZHANG En-he¹, WANG Qi^2,3, LIU Qing-lin¹,
LIU Chao-wei¹, WANG Tian-tao², YIN Hui²
(1. Agronomy College, Gansu Agricultural University, Lanzhou 730070, China; 2. College of Grassland
Science, Gansu Agricultural University, Lanzhou 730070, China; 3. State Key Laboratory of Frozen
Soils Engineering and Cryosphere Research Station of the Qinghai-Tibetan Plateau,
Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou 730000, China)

Online:2013-06-20 Published:2013-06-20

摘要/Abstract

摘要： 在甘肃省石羊河流域绿洲灌区,研究不同灌溉量和施氮量对留茬免耕春小麦收后0~30 cm土层土壤有机碳、土壤全氮和土壤碳氮比的影响。结果表明,在0~140 kg/hm²施氮范围,土壤全氮和有机碳含量增施氮肥均明显增加,当施氮量超过140 kg/hm²时,土壤有机碳随施氮量增加而降低,土壤全氮含量无明显变化。就平均施氮水平而言,土壤全氮和有机碳含量随灌溉量增加呈先升高后下降的趋势,适量灌溉 (节水20%灌溉) 促进土壤氮和碳的矿化速率,从而增加全氮和有机碳含量,但少量或过量灌溉降低土壤氮和碳的矿化速率,同时增加土壤氮和碳的损失,导致节水20%灌溉的土壤全氮含量(0.9 g/kg)和有机碳含量(14.22 g/kg)最高。就各灌溉水平平均值而言,当施氮达到221 kg/hm²,春小麦籽粒产量(6 365 kg/hm²)达到最大值,春小麦籽粒产量随灌溉量增加而增加。

Abstract: A controlled study of irrigation and nitrogen (N) supply was conducted in the Hexi oasis to investigate the effects of different irrigation and N supply levels on soil organic carbon(OC), soil total nitrogen(TN), soil carbon and nitrogen ratio (OC/TN) of spring wheat on no-tillage farmland with standing stubble. With an increase in N supply rate, TN and OC contents considerably increased in soils. However, when N supply rates were higher than 140 kg N/ha, TN did not continuously increase with the increase in N supply rate, and OC even showed a decreasing trend. Irrespective of nitrogen levels, with an increase in irrigation level, TN and OC contents initially increased but then decreased in soils. An appropriate amount of irrigation (20% water-saving irrigation) promoted the mineralization rate of soil nitrogen and carbon, thus increasing the TN and OC contents. However, a smaller amount of, or excessive, irrigation reduced soil nitrogen and carbon mineralization rates, and increase soil nitrogen and carbon losses. The highest TN (0.9 g/kg) and OC (14.22 g/kg) were measured under 20% water-saving irrigation. When the N supply rate was 221 kg N/ha, the grain yield reached a maximum (6 365 kg/ha) irrespective of the irrigation levels but the grain yield of spring wheat increased with an increase in irrigation level.

中图分类号:

S512.1⁺20.6 文献标识码:A 文章编号:1004-5759(2013)03-0227-07
〖

俞华林,张恩和,王琦,刘青林,刘朝巍,王田涛,尹辉 . 灌溉和施氮对免耕留茬春小麦农田土壤有机碳、全氮和籽粒产量的影响[J]. 草业学报, 2013, 22(3): 227-.

YU Hua-lin, ZHANG En-he, WANG Qi, LIU Qing-lin, LIU Chao-wei, WANG Tian-tao, YIN Hui. Effects of irrigation and N supply levels on soil organic carbon, total nitrogen and
grain yield of spring wheat on no-tillage farmland with standing stubble[J]. Acta Prataculturae Sinica, 2013, 22(3): 227-.

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灌溉和施氮对免耕留茬春小麦农田土壤有机碳、全氮和籽粒产量的影响

Effects of irrigation and N supply levels on soil organic carbon, total nitrogen and
grain yield of spring wheat on no-tillage farmland with standing stubble

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灌溉和施氮对免耕留茬春小麦农田土壤有机碳、全氮和籽粒产量的影响

Effects of irrigation and N supply levels on soil organic carbon, total nitrogen and grain yield of spring wheat on no-tillage farmland with standing stubble

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