?? ?????75%??????????

????:????spa?????:??98???

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

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