@article{Wu:208928,
      recid = {208928},
      author = {Wu, Xiaoxia and Gu, Zhujun},
      title = {The Influence of Time Scale on the Quantitative Study of  Soil and Water Conservation Effect of Grassland},
      journal = {Asian Agricultural Research},
      address = {2015-04},
      number = {1812-2016-144452},
      pages = {6},
      year = {2015},
      abstract = {Quantitative analysis of time scale effects is conducive  to further understanding of vegetation water and soil  conservation mechanism. Based on the observation data of  the grass covered and bare soil (control) experimental  plots located in Hetian Town, Changting County of Fujian  Province from 2007 to 2010, the characteristics of 4  parameters (precipitation, vegetation, RE and SE) were  analyzed at precipitation event, month, season, and annual  scales, and then the linear regression models were  established to describe the relationships between RE(SE)  and its influencing factors of precipitation and  vegetation. RE (SE) means the ratio of runoff depth (soil  loss) of grass covered plot to that of the control plot.  Results show that these 4 parameters presented different  magnitude and variation on different time scales. RE and SE  were relatively stable either within or among different  time scales due to their ratios reducing the influence of  other factors. The coupling of precipitation and vegetation  led to better water conservation effect at lower RE (< 0.3)  at precipitation event scale as well as at season scale,  while the water conservation effect was dominated by  precipitation at slightly higher (0.3-0.4) and higher  (>0.7) REs at precipitation event scale as well as at  annual scale (R2 > 0.78). For the soil conservation effect,  precipitation or/and vegetation was/were the dominated  influence factor(s) at precipitation event and annual  scales, and the grass LAI could basically describe the  positive conservation effect (SE<1，R2>0.55), while the  maximum 30 min intensity (I30) could describe the negative  conservation effect more accurately (SE>1, R2>0.79). More  uncertainties (R2≈0.4) exist in the models of both RE and  SE at two moderate time scales (month and season).  Consequently, factors influencing water and soil  conservation effect of grass present different variation  and coupling characteristics on different time scales,  indicating the importance of time scale at the study on  water and soil conservation.},
      url = {http://ageconsearch.umn.edu/record/208928},
      doi = {https://doi.org/10.22004/ag.econ.208928},
}