| 放牧强度对草甸植物小叶章及土壤化学计量比的影响 |
| |
| 引用本文： | 张婷,翁月,姚凤娇,史印涛,崔国文,胡国富.放牧强度对草甸植物小叶章及土壤化学计量比的影响[J].草业学报,2014,23(2):20-28. |
| |
| 作者姓名： | 张婷 翁月 姚凤娇 史印涛 崔国文 胡国富 |
| |
| 作者单位： | 1.东北农业大学生命科学学院,黑龙江 哈尔滨 150030;2.东北农业大学动物科学技术学院,黑龙江 哈尔滨 150030 |
| |
| 基金项目： | 公益性行业(农业)科研专项“不同区域草地承载力与家畜配置”(200903060)资助。 |
| |
| 摘 要： | 本试验在不同放牧强度下,通过分析东北三江平原小叶章草甸的优势植物和土壤的碳氮磷养分及化学计量比,探讨放牧对生态系统化学计量学特征和养分循环速率的影响机制。试验结果表明,1)随着放牧强度的增加,小叶章活体与立枯物的全氮、全磷含量也随之增加,放牧使小叶章叶的全氮含量明显增加,而茎的变化不显著;0～10 cm土层根系的全碳、全氮、全磷变化比10～20 cm的更敏感;放牧降低了土壤全碳的含量,土壤表层的全氮含量随放牧强度的增加呈先增加后降低的趋势,且以重牧区为最小。2)在6-8月份小叶章全株及叶的C/N值随着放牧强度的增加先降低后升高,且在中牧区降为最小值,茎的C/N值受放牧的影响变化规律不明显,只有在8月份中牧区表现为最小值;3)放牧主要影响土壤表层的理化性状以及所含根系的元素含量,7-9月份随着放牧强度的增加,0～10 cm土壤的C/N值降低;7,8月份0～10 cm土层根系的的C/N值随着放牧强度的增加先降低后升高,且在中牧区为最小值,而N/P值却在中牧区为最大值。
|
| 关 键 词： | 三江平原 小叶章草甸 放牧强度 化学计量比 |
| 收稿时间： | 2013-04-28 |
Effect of grazing intensity on ecological stoichiometry of Deyeuxia angustifolia and meadow soil |
| |
| ZHANG Ting,WENG Yue,YAO Feng-jiao,SHI Yin-tao,CUI Guo-wen,HU Guo-fu.Effect of grazing intensity on ecological stoichiometry of Deyeuxia angustifolia and meadow soil[J].Acta Prataculturae Sinica,2014,23(2):20-28. |
| |
| Authors: | ZHANG Ting WENG Yue YAO Feng-jiao SHI Yin-tao CUI Guo-wen HU Guo-fu |
| |
| Institution: | 1.Life Science College of Northeast Agricultural University, Harbin 150030, China;2.College of Animal Science and Technology of Northeast Agriculture University, Harbin 150030, China |
| |
| Abstract: | The role of grazing on the stoichiometry traits of soil and plants in Deyeuxia angustifolia meadows of the northeast Sanjiang Plain were studied under different grazing intensities. We determined the C, N, and P contents and the C/N ratios of plant and soil to explore how grazing affects the stoichiometry traits and nutrient cycling rates in an ecosystem. 1) With an increase of grazing intensity, the N and P contents of ground-living and standing litter was increased. The N content of leaves increased with grazing while the stem changes were not obvious. The change of C, N, and P contents of roots in the 0-10 cm soil layer was more sensitive than that in the 10-20 cm soil layer. Grazing reduced the content of total soil carbon while the TN (total N) content of the soil surface initially increased but then decreased with an increase of grazing intensity, and the minimum value was in heavy grazing. 2) With an increase of grazing intensity, the C/N ratio of the entire plant and the leaves were initially increased but then decreased in June to August, and the smallest value was in moderate grazing, the change of C/N ratio of stems was not obvious, but was smallest in August. 3) Grazing mainly impacted the physical and chemical properties of the surface soil and the roots in it. The C/N ratio was reduced in the 0-10 cm soil layer with an increase of grazing intensity in July to September. The C/N ratio of roots in the 0-10 cm was initially reduced but then increased with an increase of grazing intensity in July and August: moderate grazing had the smallest value, while the N/P ratio had the maximum value. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《草业学报》浏览原始摘要信息 |
| 点击此处可从《草业学报》下载免费的PDF全文 |
|
