...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of soils & sediments >Factors affecting ~(13)C enrichment of vegetation and soil in temperate grasslands in Inner Mongolia, China
【24h】

Factors affecting ~(13)C enrichment of vegetation and soil in temperate grasslands in Inner Mongolia, China

机译：影响内蒙古温带草地植被及土壤的影响因素

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Purpose Soil organic carbon (SOC) dynamics are central to understanding the effects of environmental change on the carbon cycle of ecosystems. Vegetation and soil stable carbon isotope composition (delta C-13), especially the difference of delta C-13 between surface soils and source vegetation (Delta delta C-13), can provide useful information about the SOC dynamics. The variations and patterns of vegetation and soil delta C-13 and Delta delta C-13 along climatic and edaphic gradients were analyzed to improve the understanding of SOC dynamics in temperate grassland ecosystems.Materials and methods Soil and plant samples were collected along climatic and edaphic gradients. Meteorological data were extracted from a regional climate database, which was spatially interpolated based on the records at 107 climatic stations located in Inner Mongolia. delta C-13, carbon and nitrogen contents of soil and plant, soil pH, soil clay, silt, and sand contents were determined. Delta delta C-13 and soil C:N were calculated. The integrative effects of these factors were further estimated using stepwise regression, redundancy analysis (RDA) and T value biplots.Results and discussion As expected, soil delta C-13 was positively related to vegetation delta C-13, and higher than the vegetation delta C-13. Vegetation and soil delta C-13 and Delta delta C-13 were all related to growing season precipitation (GSP) and growing season temperature (GST). However, when climatic and edaphic factors were considered together, vegetation delta C-13 was positively related to GST and soil C:N, soil delta C-13 was positively related only to GST, and Delta delta C-13 was negatively related only to soil C:N. Unlike previous research conducted at the species level which only included C-3 species, GST, instead of precipitation, was the dominant controlling factor of vegetation delta C-13.Conclusions GST influences vegetation delta C-13 mainly through its effect on relative abundance of C-4 plants. Soil C:N rather than climatic factors is the dominant controlling factor of SOC decomposition, and the effects of climatic factors on SOC decomposition are indirect and induced by their effects on soil C:N through influencing species composition and plant C:N. Measuring vegetation delta C-13, soil delta C-13, and Delta delta C-13 simultaneously is necessary to comprehensively understand how environmental changes influence ecosystem carbon cycles.
机译：目的土壤有机碳（SOC）动态是了解环境变化对生态系统碳循环的影响。植被和土壤稳定的碳同位素组成（Delta C-13），尤其是表面土壤和源植被之间的Delta C-13的差异（Delta Delta C-13），可以提供有关SOC动态的有用信息。分析了植被和土壤δC-13和Delta delta C-13沿气候和助辅助梯度的变化和模式，以改善温带草地生态系统中SoC动态的理解。在气候和仿生中收集土壤和植物样品的材料和方法渐变。从区域气候数据库中提取了气象数据，该数据库基于位于内蒙古的107个气候站的记录，在空间地插值。确定了土壤和植物，土壤pH，土壤粘土，淤泥和砂内容物的达达C-13，碳和氮含量。计算ΔδC-13和土壤C：N。使用逐步回归，冗余分析（RDA）和T值双滴度进一步估计这些因素的整合效果。结果和讨论如预期，土壤δC-13与植被Delta C-13正面相关，高于植被Delta C-13。植被和土壤δC-13和Delta delta C-13都与生长季节降水（GSP）和生长季节温度（GST）有关。然而，当共同考虑气候和助剂因素时，植被Delta C-13与GST和土壤C-13正面相关：N，土壤δC-13仅与GST呈正相关，ΔδC-13仅呈负相关土壤c：n。与以往的研究不同，只有仅包含C-3种，GST，代替沉淀的物种，代替沉淀，是植被Delta C-13的主要控制因子。结论GST主要通过其对相对丰度的影响来影响植被δC-13 C-4植物。土壤C：n而不是气候因素是SoC分解的主要控制因素，气候因素对SoC分解的影响是间接的，通过它们对土壤C：n的影响来引起的，通过影响物种组成和植物C：n：n。测量植被Delta C-13，土壤三角洲C-13和Delta Delta C-13同时是必要的，以全面了解环境变化如何影响生态系统碳循环。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号