放牧地伊犁绢蒿营养元素分配特点  

Characteristics of nutrition allocation of Seriphidium transiliense under grazing condition

作　　者：宋智芳[1] 安沙舟[1] 孙宗玖[1] 

机构地区：[1]新疆农业大学草业与环境科学学院新疆草地资源与生态重点实验室,新疆乌鲁木齐830052

出　　处：《草业科学》2014年第1期132-138,共7页Pratacultural Science

基　　金：国家自然基金(31160477);教育部高等学校博士学科点专项科研基金项目(20096504110002);新疆草地资源与生态重点实验室开放课题项目(XJDX0209-2007-05)

摘　　要：以蒿类荒漠草地上的建群种伊犁绢蒿（Seriphidium transiliense）为对象, 研究其根、茎、叶、花/种子中的氮、磷、钾、有机碳含量及其贮量分配对放牧干扰的响应。结果表明, 放牧导致伊犁绢蒿根中的磷含量减少, 花/种子中的氮、磷、钾以及有机碳含量减少, 而放牧对其他构件中营养元素的影响不一致。从分配格局来看, 放牧后根中的钾、有机碳的分配增加, 分别为3.16%-12.79%、2.12%-12.74%;茎、叶和花中钾和碳元素分配减小, 钾元素分别减少1.67%-14.13%、1.49%-2.89%和0.33%-0.41%, 碳元素分别减少6.45%-11.37%、0.77%-4.18%和0.01%-0.09%。在营养期和开花期放牧后, 伊犁绢蒿根中氮分配增加, 增加11.91%-18.45%;茎和叶中氮分配减小, 分别为8.00%-14.58%、1.78%-4.76%, 磷分配规律性不明显。In order to understand resources allocation pattern of Seriphidium transiliense under grazing condition, the content and storage allocation of carbon, nitrogen, phosphorus and potassium of roots, stems, leaves and flowers （or seeds） were measured. The results showed that the phosphorus content of roots, the nitrogen, phosphorus, potassium and carbon content of flowers or seeds decreased under grazing condition and the other nutrition content changed complicatedly without regular pattern. It proved that grazing contribute to potassium and carbon accumulation allocation of S.transiliense. The rates of potassium and carbon accumulation allocation in roots increased by 3.16%～12.79% and 2.12%～12.74%, respectively. The rates of potassium accumulation allocation decreased in stems, leaves and flowers （seeds） by 1.67%～14.13%, 1.49%～2.89% and 0.33%～0.41%, respectively. The rates of the carbon reserve allocation decreased in stems, leaves and flowers （seeds） by 6.45%～11.37%, 0.77%～4.18% and 0.01%～0.09%, respectively. During vegetative period and flowering stage, the nitrogen accumulation allocation of S.transiliense in root increased by 11.91%～18.45% and that in leaves and flowers （seeds） decreased by 8%～14.58% and 1.78%～4.76%, respectively. The phosphorus accumulation allocation had no relationship with grazing.

关 键 词：伊犁绢蒿 营养元素 资源分配 放牧 

分 类 号：S812.29[农业科学—草业科学]