萘对川西亚高山森林土壤呼吸、养分和酶活性的影响

发布时间：2018-03-16 11:17

本文选题：萘　切入点：土壤呼吸　出处：《应用生态学报》2017年06期 　论文类型：期刊论文

【摘要】：萘作为土壤动物化学抑制剂已在土壤动物生态功能的研究中广泛使用,但其非目标效应使其应用仍存在很大的不确定性.为了了解在亚高山森林土壤应用萘抑制土壤动物群落是否存在非目标效应,以青藏高原东缘的川西亚高山森林土壤为研究对象,采用微缩试验研究了萘对土壤呼吸速率、养分含量和酶活性的短期影响.结果表明:萘处理显著抑制了培养0~10 d的土壤呼吸速率,随后(24~52 d)表现出明显的促进作用.萘处理显著影响了土壤铵态氮和硝态氮含量的动态变化,萘处理铵态氮和硝态氮含量分别以培养的3和17 d最高,对照则以培养的45 d和结束时的52 d最高.萘处理土壤可溶性碳含量在培养3 d急剧增加后迅速降低,对照则略有升高后降低,而萘处理和对照的可溶性氮含量均表现为先升高后降低.萘处理和对照的土壤酶活性均具相似的动态规律,两者的脲酶、硝酸还原酶和亚硝酸还原酶活性分别在培养45、38和10 d至最高.萘处理和采样时间的交互作用显著影响了土壤呼吸速率,以及土壤铵态氮、硝态氮和可溶性氮含量,但对可溶性碳含量、蔗糖酶、硝酸还原酶和亚硝酸还原酶活性的影响不显著.萘作为驱虫剂的非目标效应可能在短期内对川西亚高山森林土壤的氮循环过程产生强烈的影响.
[Abstract]:Naphthalene, as a soil animal chemical inhibitor, has been widely used in the study of the ecological function of soil animals. However, its application is still uncertain due to its non-target effect. In order to find out whether there is a non-target effect in subalpine forest soil using naphthalene to inhibit soil animal community, The soil respiration rate of naphthalene on the eastern edge of Qinghai-Xizang Plateau was studied by microscale experiment. The results showed that naphthalene treatment significantly inhibited soil respiration rate for 10 days. Naphthalene treatment significantly affected the dynamic changes of soil ammonium nitrogen and nitrate nitrogen content, and the highest ammonium and nitrate nitrogen contents were observed at 3 and 17 days after the treatment of naphthalene, respectively. The soil soluble carbon content of Naphthalene treatment decreased rapidly after 3 days of culture, while the content of soil soluble carbon in Naphthalene treatment decreased slightly after 3 days of culture. The content of soluble nitrogen in naphthalene treatment and control was increased first and then decreased. The soil enzyme activity of naphthalene treatment and control had similar dynamic regularity. The activities of nitrate reductase and nitrite reductase reached their highest values in culture for 45 days and 10 days, respectively. The interaction between naphthalene treatment and sampling time significantly affected the soil respiration rate and the contents of ammonium nitrogen, nitrate nitrogen and soluble nitrogen in the soil. However, the effects of naphthalene on the activities of soluble carbon, sucrase, nitrate reductase and nitrite reductase were not significant.
【作者单位】：四川农业大学生态林业研究所/长江上游林业生态工程四川省重点实验室/高山森林生态系统定位研究站/水土保持与荒漠化防治省级重点实验室;长江上游生态安全协同创新中心;绵阳师范学院生态安全与保护四川省重点实验室;
【基金】：国家自然科学基金项目(31500509,31570445,31500358) 高等学校博士学科点专项科研基金项目(20135103110002) 四川省教育厅青年项目(14ZB0001) 生态安全与保护四川省重点实验室开放基金项目(ESP201309,ESP1404) 四川农业大学科研兴趣培养项目(20150214)资助~~
【分类号】：S714

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