用于土壤流失量遥感监测的植被因子算式的初步研究

PRELIMINARY STUDY ON ALGORITHM FORMULA OF VEGETATIVE FACTOR FOR UNDISTURBED AREAS IN REMOTE SENSING MONITORING SOIL LOSS

基于标桩法实测到国内较大量的土壤年流失量及有关参数资料,建立了山丘植被区较为可靠的植被因子算式。它比 USLE 查表法定C值较便于应用在土壤流失量的遥感监测中。按照植被因子算式,C 值与植被覆盖度成反比,且其变化范围随植被覆盖度大于78.8%或76.1%～0%而变为0～0.45。经与反算 C 值和实测流失量验证,应用植被因子算式监测流失量的精度平均为77.4%或82.1%,多数在80%以上。

The method,measuring data,results and discussion on algorithm research of vegetative factor for undisturbed areas is introduced.According to measuring data of the annual soil loss and its pa- rameter by means of marked piles,formula of vegetative foctor has been created.It can be used more conveniently on remote sensing monitoring soil loss in comparison with looking for USLE's C— value table.The C formula is Shown that relation between C value and vegetative cover c is inverse ratio,and change range of C value is 0.45～0 along with change range(0～80%)of vegetative cover c.As compared with measuring annual soil loss(?),the greater part accuracy of monitoring annual soil loss,the greater part accuracy of monitoring annual soil loss exceed 80%,average accuracy is 77.4% or 82.1%.