维普中文期刊产品整合服务

Biological soil crust distribution in Artemisia ordosica communities along a grazing pressure gradient in Mu Us Sandy Land, Northern China

查看全文 作　　者：JunHong [1]ZHANG;Bo [1]WU;YongHua [1]LI;WenBin [1]YANG;YaKai [2]LEI;HaiYan [1]HAN;Ji [1]HE 高影响力作者 机构地区：[1]Institute of Desertification Studies, Chinese Academy of Forestry;[2]College of Forestry, Henan Agricultural University高影响力机构 出　　处：《Journal of Arid Land》索引2013年第5卷第2期,共8页高影响力期刊 基　　金：Funding was provided by the National Key Technology R&DP rogram (2012BAD16B01);the Special Research Program for Public-welfare Forestry of China (201104077);the National Natural Science Foundation of China (31170667) 摘　　要：This study investigated the distribution pattern of biological soil crust (BSC) in Artemisia ordosica communities in Mu Us Sandy Land. Three experimental sites were selected according to grazing pressure gradient. In each experimental site, the total vegetation cover, A. ordosica cover, BSC cover, litter-fall cover, BSC degree of fragmentation, BSC thickness and soil properties were investigated in both fixed and semi-fixed sand dunes and simultaneously analyzed in the laboratory. The results showed that at the same grazing pressure, BSC cover and composition were significantly affected by the fixation degree of sand dunes. In addition, BSC cover in the fixed sand dunes was 83.74% on average, whereas it is proportionally dominated by 28% mosses, 21% lichens, and 51% algae. Meanwhile, BSC cover in the semi-fixed sand dunes was 23.54% on average, which is proportionally dominated by 6.3% mosses, 2.5% lichens, and 91.2% algae. Fine sand, organic matter, and total nitrogen (N) contents in the fixed sand dunes were all significantly higher than those in the semi-fixed sand dunes. Litter-fall cover decreased along the grazing pressure gradient, whereas BSC fragmentation degree increased. Fine sand content decreased along with the increase of grazing pressure, whereas medium sand content increased in both fixed and semi-fixed dunes. The organic matter and total N contents in the no grazing site were significantly higher than those in light and normal grazing sites. However, there were no significant differences between the light and normal grazing sites. In addition, there were also no significant differences in BSC thickness between the light and normal grazing sites in the fixed sand dunes. However, a significant decrease was observed in both BSC cover and thickness in the normal grazing site. The BSC in the semi-fixed dunes was more sensitive to disturbance. 关 键 词：生物土壤结皮 放牧压力 毛乌素沙地 压力梯度 油蒿群落 中国北方 半固定沙丘 BSC
相关文献

参考文献(36)

引证文献(12)

耦合文献(135)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费