绿洲调亏灌溉春小麦农田生态化学计量特征  

Ecological stoichiometric characteristics of oasis spring wheat fields under regulated deficit irrigation

作　　者：张恒嘉[1] 黄高宝[2] 

机构地区：[1]甘肃农业大学工学院水利系,兰州730070 [2]甘肃农业大学农学院,兰州730070

出　　处：《中国生态农业学报》2011年第1期59-62,共4页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目(40801044);甘肃省高等学校研究生导师科研计划项目(0602-05)资助

摘　　要：用配对样本t检验对绿洲不同调亏灌溉下春小麦收获时土壤C∶N和C∶P生态化学计量比年际间差异及土壤碳平衡进行了分析研究,结果表明：小麦收获时不同调亏灌溉处理0~20cm、20~40cm和0~40cm土层C∶N2008年比2007年分别显著降低19.0%~37.3%、11.8%~27.9%和17.1%~32.8%,而C∶P则显著增加31.9%~62.4%、16.5%~79.1%和33.6%~68.8%。两年试验表明,拔节期轻、中度水分调亏,孕穗~抽穗期轻度调亏或丰水处理,而灌浆~生理成熟期中、重度调亏的处理RDI2和RDI5C∶N和C∶P生态化学计量比高于其他处理。两年试验后,不同土层调亏灌溉处理及对照土壤有机碳均增高,其中0~20cm土层增幅为1.31~2.35t（C）·hm-2,20~40cm土层为2.00~4.58t（C）·hm-2,0~40cm土层为2.18~3.07t（C）·hm-2。Differences in soil C∶N and C∶P ratios at oasis spring wheat under regulated deficit irrigation were analyzed for two experimental years using Paired-Sample T-Test. Soil organic C balance was also analyzed which provided basic data for soil nutrient element transformation and cycling. The study was a proxy for further advances and expansion of ecological stoichiometric theory. Compared with 2007, results indicated that C∶N ratio in the 0~20 cm, 20~40 cm and 0~40 cm soil layers at field of oasis spring wheat harvested in 2008 significantly dropped by 19.0%~37.3%, 11.8%~27.9% and 17.1%~32.8%, respectively. Concurrently, C∶P ratio significantly increased by 31.9%~62.4%, 16.5%~79.1% and 33.6%~68.8%, respectively. Higher C∶ N and C ∶P ratios were observed under the treatments with light or medium water deficit in jointing stage, light or not water deficit in booting to heading stage, and medium or sever water deficit in filling to maturing stage. Furthermore, soil organic C content in different soil layers in-creased after two years of experimentation. It increased by 1.31~2.35 t（C）·hm-2 in the 0~20 cm layer, 2.00~4.58 t（C）·hm-2 in the 20~40 cm layer and by 2.18~3.07 t（C）·hm-2 in the 0~40 cm layer.

关 键 词：生态化学计量特征 碳平衡 调亏灌溉 春小麦农田 绿洲 

分 类 号：S512.1[农业科学—作物学]