短花针茅种群高度对放牧调控的响应

发布时间：2018-12-14 22:28

【摘要】：种群高度是植物行为策略的核心内容,也是解析植物种群对草食动物调控机制的潜在途径。本研究以内蒙古锡林郭勒盟苏尼特右旗荒漠草原的长期放牧控制实验为平台,通过研究荒漠草原建群种短花针茅(Stipa breviflora)叶宏观性状、叶解剖性状与叶营养含量3个维度,以期揭示荒漠草地放牧调控下植物高度的响应机制。结果表明:短花针茅叶高可塑性指数(PI)较高,叶长次之;叶解剖结构显示,叶片厚度可塑性指数较高,重度放牧处理下叶性状可塑性指数大于适度放牧处理;叶C、N、P含量可塑性指数变化呈PINPIPPIC;适度放牧短花针茅叶高大于不放牧处理,不放牧叶高大于重度放牧处理;重度放牧叶上表皮细胞面积低于其他处理,且放牧处理提高了叶片N含量;短花针茅叶高与叶长、叶宽、叶直立度呈极显著正相关,与叶卷曲度呈负相关,与上表皮细胞面积、上表皮细胞厚度呈极显著正相关,与C含量呈极显著正相关。
[Abstract]:Population height is the core content of plant behavior strategy and a potential way to analyze the regulation mechanism of plant population to herbivores. Based on the long-term grazing control of the desert steppe of Sunita right Banner in Xilinguole League, Inner Mongolia, this study studied three dimensions of leaf macroscopical character, leaf anatomical character and leaf nutrition content of Stipa breviflora (Stipa breviflora), a species in desert steppe. In order to reveal the response mechanism of plant height under grazing control in desert grassland. The results showed that the leaf height plasticity index (PI) was higher, the leaf length was the second, the leaf thickness plasticity index was higher and the leaf character plasticity index under heavy grazing was higher than that under moderate grazing. The change of plasticity index of leaf C _ (+) N _ (+) P content showed that the leaf height of PINPIPPIC; moderate grazing was higher than that of non-grazing treatment, and that of non-grazing leaf height was higher than that of heavy grazing treatment. The area of epidermal cells in heavy grazing leaves was lower than that of other treatments, and the N content of leaves was increased by grazing treatment. Leaf height was positively correlated with leaf length, leaf width and leaf straightness, negatively correlated with leaf curl, and positively correlated with area of upper epidermal cells, thickness of upper epidermal cells, and C content.
【作者单位】：内蒙古农业大学草原与资源环境学院;内蒙古农业大学理学院;
【基金】：国家自然科学基金项目(31460126) 国家重点基础研究发展计划项目(2014CB138805) 内蒙古自治区博士研究生科研创新项目(B20161012906Z)资助
【分类号】：S812

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