水热条件对华西雨屏区檫木人工林土壤氮矿化的影响  

Effects of Moisture and Temperature on the Soil Nitrogen Mineralization of Sassafras Tzumu Plantations in Rainy Area of West China

作　　者：周于波 王景燕[1,2] 黄帅 龚伟 唐海龙[1] ZHOU Yubo;WANG Jingyan;HUANG Shuai;GONG Wei;TANG Hailong(College of Forestry, Sichuan Agricultural University/Sichuan Provincial Key Laboratory of Ecological ForestryEngineering, Chengdu 611130, China;State Key Laboratory of Soil and Sustainable Agriculture, Institute ofSoil Science, Chinese Academy of Sciences, Nanjing 210008, China)

机构地区：[1]四川农业大学林学院林业生态工程四川省重点实验室,四川成都611130 [2]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008

出　　处：《云南农业大学学报（自然科学版）》2019年第3期479-485,共7页Journal of Yunnan Agricultural University:Natural Science

基　　金：国家自然科学基金项目(41201296);土壤与农业可持续发展国家重点实验室开放课题(Y412201424)

摘　　要：【目的】预测华西雨屏区檫木人工林土壤供氮潜力和氮矿化对温度和含水量的响应。【方法】采用室内培养法研究檫木人工林土壤在不同温度(5、15、25和35℃)和含水量[20%、40%、60%和80%的田间持水量(FWC)]处理条件下的氮矿化特征。【结果】土壤净氨化速率、净硝化速率和氮净矿化速率均随温度和含水量的升高而呈先升高后降低趋势,最大值均出现在25℃+60%FWC处理,且与除25℃+80%FWC外的其他处理差异显著(P<0.05)。土壤氮净矿化速率(y_3)对温度(x_1)和含水量(x_2)的响应模型为y_3=-1.671 3+0.278 0x_1+7.541 3x_2-0.005 6x_1~2-6.404 4x_2~2+0.008 8x_1x_2 (R^2=0.952, n=48),得出有利于促进土壤氮净矿化的最佳温度和含水量分别为25.6℃和61%FWC。土壤氮矿化作用在5～15℃范围内最敏感。【结论】华西雨屏区檫木人工林能够适应全球变暖趋势,可以增加土壤可利用氮含量,有较好的供氮潜力。[Purpose]In order to predict the nitrogen supply potential and the response of soil nitrogen mineralization to temperature and water content of Sassafras tzumu plantation in the Rainy Area of West China.[Method]A laboratory incubation experiment was conducted to study the nitrogen mineralization characteristics of S. tzumu plantations under different temperatures (5, 15, 25 and 35℃) and water contents [20%, 40%, 60% and 80% field water capacity (FWC)].[Result]The net ammonification rate, net nitrification rate and net nitrogen mineralization rate increased first and then decreased with the increase of temperature and water content, in particular, the maximum values were at 25℃+60% FWC treatment and were significantly different from other treatments (P<0.05), except the treatment of 25 ℃+80% FWC. The response model of soil nitrogen net mineralization rate (y3) to temperature (x1) and water content (x2) was y3=?1.671 3+0.278 0x1+7.541 3x2?0.005 6x1^2-6.404 4x2^2+ 0.008 8x1x2 (R^2=0.952, n=48). The optimum temperature and water content for promoting soil nitrogen mineralization were 25.6 ℃ and 61% FWC, respectively. Soil nitrogen mineralization was the most sensitive in the range of 5-15 ℃.[Conclusion]The S. tzumu plantations in rainy area of West China can adapt to the trend of global warming, increase soil available nitrogen content, and have good potential for nitrogen supply.

关 键 词：温度 含水量 华西雨屏区 檫木 氮矿化 

分 类 号：S714[农业科学—林学] S718.512