文献类型：期刊文献

中文题名：南亚热带马尾松人工林土壤氮矿化对减雨的响应

英文题名：Responses of soil nitrogen mineralization to throughfall reduction in a Pinus massoniana plantation in southern China

作者：闵惠琳[1,2] 陈琳[1,2] 刘世荣[3] 曾冀[1] 李华[1,2] 郑路[1,2]

第一作者：闵惠琳

机构：[1]中国林业科学研究院热带林业实验中心,凭祥532600;[2]广西友谊关森林生态系统国家定位观测研究站,凭祥532600;[3]中国林业科学研究院,北京100091

年份：2021

卷号：41

期号：13

起止页码：5289-5299

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金面上项目(31971655);中国林业科学研究院中央级公益性科研院所基金科研业务费专项资金项目(CAFYBB2017QA026)。

语种：中文

中文关键词：穿透雨减少;马尾松;土壤氮矿化;土壤酶活性;土壤微生物

外文关键词：throughfall reduction;Pinus massoniana;soil nitrogen mineralization;soil enzyme activity;soil microbe

分类号：S714.2

摘要：为预测降水变化对人工林生态系统土壤氮矿化过程的影响,以南亚热带马尾松(Pinus massoniana Lamb.)人工林为研究对象,采用PVC顶盖埋管法,研究穿透雨减少50%和不减雨(对照)下土壤氮矿化特征。铵态氮是南亚热带马尾松人工林无机氮存在的主要形态,土壤氮矿化以氨化作用为主。穿透雨减少显著降低了土壤净硝化速率、土壤含水量、pH、可溶性有机碳含量、过氧化物酶及丛枝菌根真菌饱和脂肪酸,而显著增加了土壤净氨化速率、硝态氮、N-乙酰-葡萄糖苷酶和蛋白酶,但是影响程度因季节和土层而异。土壤净氨化速率与N-乙酰-葡萄糖苷酶呈极显著负相关,土壤含水量是对土壤净硝化速率影响力最大的变量,β-葡萄糖苷酶、真菌饱和脂肪酸及细菌真菌饱和脂肪酸比的影响次之。表明短期降水减少显著改变了马尾松人工林的土壤理化性质、净氨化和硝化速率,这可能会进一步影响其树木生长和养分吸收。
To better predict responses of soil nitrogen mineralization to the changes of precipitation variations in plantation ecosystem,a throughfall reduction experiment including 50%of throughfall and natural rainfall(control)treatments was conducted in Pinus massoniana plantation in southern subtropical China.Soil nitrogen mineralization rates were measured by closed-top tube incubation method.The soil nitrogen mineralization of Pinus massoniana plantation was dominated by ammonification.The throughfall reduction treatment significantly decreased soil net nitrification rate,soil water content,pH,soluble organic carbon,peroxidase and AMF PLFAs.Conversely,the throughfall reduction treatment significantly increased soil net ammonification rate,NO-3?N N?acetyl?glucosidase and leucine?amino?peptidase,which varied with different seasons and the soil layers.Soil net ammonification rate was significantly negatively correlated with N?acetylglucosaminidase.The variable that had the greatest influence on the soil net nitrification rate was the soil water content,followed by β?glucosidase,fungal PLFAs and Bacteria/Fungi ratio.The results indicated that the short?term experimental throughfall reduction significantly altered soil physichemical properties,soil net ammonification rate and soil net nitrification rate,which could further affect the tree growth and nutrient uptake of Pinus massoniana plantation.