氮磷添加对内蒙古温带典型草原地下生物量的影响

doi:10.13292/j.1000-4890.202104.003

生态学杂志 ›› 2021, Vol. 40 ›› Issue (4): 929-939.doi: 10.13292/j.1000-4890.202104.003

氮磷添加对内蒙古温带典型草原地下生物量的影响

郭旋^1,2,胡中民³,李胜功^1,4,5,郭群^1,4,5*

(¹中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室，北京 100101；²中国科学院大学中丹学院，北京 100190；³华南师范大学地理科学学院，广州 510631； ⁴中国科学院大学资源与环境学院，北京 100190； ⁵国家生态科学数据中心，北京 100101)

出版日期:2021-04-10 发布日期:2021-04-07

Effects of nitrogen and phosphorus additions on belowground biomass of temperate typical steppe in Inner Mongolia.

GUO Xuan^1,2, HU Zhong-min³, LI Sheng-gong^1,4,5, GUO Qun^1,4,5*

(¹Key Laboratory of Ecosystem Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; ²SinoDanish Center for Education and Research, University of Chinese Academy of Sciences, Beijing 100190, China; ³School of Geography, South China Normal University, Shipai Campus, Guangzhou 510631, China; ⁴College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China; ⁵National Ecosystem Science Data Center, Beijing 100101, China).

Online:2021-04-10 Published:2021-04-07

摘要/Abstract

摘要： 氮添加促进地上生物量具有饱和效应以及氮饱和后的磷限制是当前生态学研究的热点问题，但地下生物量是否具有类似现象，以及氮磷同时添加是否能够缓解饱和状态时地下生物量的养分限制研究相对缺乏。本研究基于内蒙古温带典型草原4年控制试验分析了氮（10和40 g N·m^-2·a^-1）、磷（5和10 g P·m^-2·a^-1）添加对地下生物量的影响。结果表明：总地下生物量和表层土壤（0～5 cm）地下生物量有随着氮添加剂量增加而增加的趋势，但仅部分年份较高剂量氮添加处理（40 g N·m^-2·a^-1）的地下生物量较对照显著提高；磷添加对地下生物量没有显著影响；仅个别年份氮添加显著增加或降低了磷添加引起的地下生物量变化，其他年份氮添加不改变磷添加对地下生物量的影响，磷添加也不改变氮添加对地下生物量的影响。本研究为预测草原生态系统如何响应未来氮磷沉降增加以及草原生态系统管理提供科学依据。

关键词: 地下生物量, 氮添加, 磷添加, 内蒙古温带草原

Abstract: Lines of evidence show a saturated rate of nitrogen (N) addition for enhancing aboveground biomass (AGB), with phosphorus (P) limitation as one of the most important casual factors. However, whether belowground biomass (BGB) can mirror the responses of AGB remains unknown. Moreover, it is unclear that whether simultaneous additions of N and P could alleviate the limitation caused by single nutrient addition. To clarify the response patterns of BGB to N and P additions, we conducted a fouryear manipulative experiment (N addition: 10 and 40 g N·m^-2·a^-1; P addition: 5 and 10 g P·m^-2·a^-1) in a temperate typical steppe of Inner Mongolia, China. The results showed that total BGB and that of surface layer (0-5 cm) tended to increase with increasing rates of N addition. However, only the high rate of N addition (40 g N·m^-2·a^-1) led to significant promotion of BGB in some years. P addition did not affect BGB, irrespective of the addition rate. Moreover, P addition did not affect the response of BGB to nitrogen addition. Nitrogen addition distinctly reduced or increased the extent to which BGB responded to P addition in a few cases. Nitrogen addition had relatively insignificant influence on BGB changes induced by P addition. Our results provide a better understanding of the responses of grassland belowground biomass to the enhanced N and P deposition, with important implications for grassland management.

Key words: belowground biomass, nitrogen addition, phosphorus addition, Inner Mongolia temperate steppe.

郭旋, 胡中民, 李胜功, 郭群. 氮磷添加对内蒙古温带典型草原地下生物量的影响[J]. 生态学杂志, 2021, 40(4): 929-939.

GUO Xuan, HU Zhong-min, LI Sheng-gong, GUO Qun. Effects of nitrogen and phosphorus additions on belowground biomass of temperate typical steppe in Inner Mongolia.[J]. Chinese Journal of Ecology, 2021, 40(4): 929-939.

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氮磷添加对内蒙古温带典型草原地下生物量的影响

Effects of nitrogen and phosphorus additions on belowground biomass of temperate typical steppe in Inner Mongolia.

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