????:1????????????:????????

2???????

3????????

4????????????

5?????????????

????????????????7????2????(?????????????? ?)??????????“?”?7?2???????????????,?,???6??30?????????7????2??,?????????????????,?????,??2??????15???,??75%???

?6?????????????30??,????????????????? ?

??,7??????????1???????6??????????????2????????6??,????????,??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????,?????????:??139.7?????????????????105.4???????????99.0??????????

???????????????????????????7????????2??????15?0-20cm?????????,??75%??,25%??,????????????????

?,?,?????????,????????,?,??

?,???????????????10?,??,????,7??3?6???????????,?,?????????????????????????????;7??8???????????????,???????????????;9???13??,??,???????14?????15???,???????????????,?????,??

??,??:??,???,?????????????,?,?????,???????????????,???(????????????????????)

????????????:??????????????