Spatial heterogeneity of soil fertility,plant biomass,and productivity in grasslands

摘要：

Grassland vegetation under livestock grazing is spatially heterogeneous, because animal grazing and excretion disturb the vegetation.We clarified the relationship between spatial heterogeneity and plant production.The following assumption is plausible : plant biomass y at a site with soil fertility x varies according to Mitscherlichs (1930) growth equation among plots.That is, if soil fertility is low, then there will be little biomass, and biomass will increase with an increase in fertility ; however, if soil fertility is high, then the increase in biomass with increases in fertility is low ( Figure 1 ).Mitscherlichs equation is expressed as : y1 ＝ K1‐exp( ‐ax ),where a is the increasing coefficient,and K is the maximum limit of biomass as x → ∞.

关键词： Mitscherlichs growth equation plant biomass plant production soil fertility spatial heterogeneity

作者: Masae Shiyomi Jun Chen

作者单位: Ibaraki University,Professor Emeritus,Mito 310-8512,Japan agriculturaLand Biological College,Shanghai Jiaotong University,Shanghai 200240,China

会议类型: 国际会议

会议名称: 2008世界草地与草原大会

会议地点: 呼和浩特

会议语种:英文

在线出版日期: 2008-06-29（万方平台首次上网日期，不代表论文的发表时间）