余轩,王兴,吴婷,宋乃平
YU Xuan,WANG Xing,WU Ting,SONG Naiping

• 1:宁夏大学西北土地退化与生态系统恢复国家重点实验室培养基地
• 2:西北退化生态系统恢复与重建教育部重点实验室

摘要(Abstract)：

植物功能性状反映了植物对于生长环境的响应与适应，是植物采取不同生态策略适应环境的表征。植物功能性状的适应和生存策略研究，对干旱半干旱区脆弱草地生态系统植被恢复具有生态指示。本研究以荒漠草原放牧和围封条件下的灰钙土和风沙土植物群落为研究对象，基于野外植物群落样方调查数据、植物叶片比叶面积（SLA）、叶干物质含量（LDMC）、叶全磷含量（LTP）、叶全碳含量（LTC）、叶全氮含量（LTN）和碳氮比含量（C/N）功能性状测定，开展不同土壤生境上植物叶片功能性状对于围封和放牧的响应研究。结果表明：1）风沙土生境，SLA、LTP显著增加，灰钙土生境，LDMC、LTC、C/N显著增大；放牧处理，LTP显著增加，围封处理，C/N显著增大。相关性分析表明，LDMC和LTP在灰钙土生境下，极显著负相关（P>0.01），在风沙土生境，显著负相关（P>0.05）;LTN和LTP在灰钙土生境下极显著负相关（P>0.01），在风沙土生境显著正相关（P<0.05）；全碳和碳氮比在两种生境下均是极显著负相关（P>0.01）。因此土壤生境对植物功能性状产生影响，未来草地生态系统的治理要结合土壤生境做具体决策。
Plant functional traits reflect the response and adaptation of plants to the growing environment, and are the representations of plants adopting different ecological strategies to adapt to the environment. The study on the adaptation and survival strategies of plant functional traits is ecologically indicative of the recovery of vegetation in fragile grassland ecosystems in arid and semi-arid zones. In this study, the functional traits of plant communities of sierozem and aeolian sandy soil in desert grassland under grazing and enclosure conditions were determined based on the field survey data of plant communities, leaf specific leaf area(SLA), leaf dry matter content(LDMC), leaf total phosphorus content(LTP), leaf total carbon content(LTC), leaf total nitrogen content(LTN) and carbon to nitrogen ratio(C/N). The functional traits of plant leaves in different soil habitats were measured in response to enclosure and grazing. The results showed that: 1) SLA and LTP increased significantly in aeolian sandy soil habitat,and LDMC, LTC and C/N increased significantly in sierozem soil habitat; LTP increased significantly in grazing treatment, and C/N increased significantly in enclosure treatment. Correlation analysis showed that LDMC and LTP were highly significantly negatively correlated( P>0.01) in the sierozem habitat and significantly negatively correlated(P>0.05) in the aeolian sandy soil habitat; LTN and LTP were highly significantly negatively correlated(P>0.01) in the sierozem habitat and significantly positively correlated(P<0.05) in the aeolian sandy soil habitat;total carbon and carbon to nitrogen ratio were highly significantly negatively correlated in both habitats( P>0.01).Therefore, soil habitat has an impact on plant functional traits, and future management of grassland ecosystem should make specific decisions in combination with soil habitat.

关键词(KeyWords)： 荒漠草原;比叶面积;叶干物质含量;群落功能性状
Desert grassland;Specific leaf area;Leaf dry matter content;Community functional traits

Abstract:

Keywords:

基金项目(Foundation): 宁夏回族自治区重点研发计划（2019BFG02022）;; 国家自然科学基金（31901367）;; 宁夏自然科学基金（2019AAC03056）;; 宁夏大学博士科研启动金

作者(Author): 余轩,王兴,吴婷,宋乃平
YU Xuan,WANG Xing,WU Ting,SONG Naiping

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