?? ?????????? ?????75%??
![](https://image.chezhanri.com/2019/1204/488af760d2a7b1b21c17896927ea621e.jpg)
????:1????????:??????
2??????????
3????51??
4??????????
5?????
?????7????????????????2?(???????? ??????)?“??”?7??????????2?????????,???,?6??30?7?????????????2?,?????????,??????????????,????2?15????????,???75%????
![](http://i2.chinanews.com.cn/simg/ypt/2024/240702/a639385c-b7ae-4ed7-a515-b3dc42531859_zsite.jpg)
?????????????,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????????????,??,??????????????,???
??,?????????:???,?,?????????,?,?????,????????????,???(?)
???:??????????