二、治理措施 (一)huanchalunzuo。youyubutongzhongleishucaixishouturangyangfenqingkuangyousuobutong,tongyikuaicaidibuyaoniannianzhongzhidanyipinzhongshucai,kejingchangjinxingduozhongleidehuanchalunzuo,jinlianghunjiaolitizhongzhi,baochishengwuduoyangxing。shixinghuanchalunzuokeyichongfenliyongdili,jianshaobingchonghaidefasheng,cushituranghuanjingyouhua,jianqingdusudeduhaizuoyong。(二)增施有機肥。增施有機肥,讓凋落物歸還土壤,經過土壤物理、化學、生(sheng)物(wu)因(yin)素(su)的(de)綜(zong)合(he)作(zuo)用(yong),會(hui)形(xing)成(cheng)有(you)機(ji)膠(jiao)體(ti)腐(fu)殖(zhi)質(zhi),使(shi)土(tu)壤(rang)疏(shu)鬆(song)肥(fei)沃(wo),緩(huan)解(jie)鹽(yan)漬(zi)化(hua),改(gai)善(shan)土(tu)壤(rang)團(tuan)粒(li)結(jie)構(gou)和(he)理(li)化(hua)性(xing)質(zhi),既(ji)能(neng)提(ti)高(gao)土(tu)壤(rang)透(tou)氣(qi)性(xing)和(he)保(bao)水(shui)保(bao)肥(fei)能(neng)力(li),又(you)能(neng)提(ti)高(gao)土(tu)壤(rang)環(huan)境(jing)容(rong)量(liang)和(he)自(zi)淨(jing)能(neng)力(li),促(cu)進(jin)蔬(shu)菜(cai)根(gen)係(xi)發(fa)育(yu)及(ji)增(zeng)強(qiang)抗(kang)性(xing)。(三)適當休閑。蔬菜土壤種植多年以後,可以適當把握時機,以便讓其合理休閑,如露天菜地可利用冬季休閑時進行深翻土壤晾曬和風凍;大棚菜地可在夏季休閑時灌水蓋膜悶曬,這些措施能有效地消滅病蟲來源,促使土壤恢複肥力。(四)補bu充chong微wei肥fei。由you於yu蔬shu菜cai是shi高gao產chan作zuo物wu,隨sui著zhe商shang品pin菜cai的de外wai運yun,從cong菜cai地di中zhong帶dai走zou了le很hen多duo微wei量liang元yuan素su。微wei量liang元yuan素su肥fei料liao既ji可ke作zuo基ji肥fei施shi用yong,也ye可ke用yong作zuo根gen外wai追zhui肥fei施shi用yong,用yong以yi補bu充chong蔬shu菜cai土tu壤rang中zhong微wei量liang元yuan素su之zhi不bu足zu,如ru把ba硫liu酸suan鋅xin、硼砂、鉬酸銨、硫酸銅、硫酸錳作底肥施用,或在生長期作葉麵噴肥施用,就能緩解鋅、硼、鉬、銅、錳等微量元素的缺乏狀況。(五)shenfantudi。zhongzhishucaiyingliyongzhongzhijiangeqijinxingshengengfantu,rushitaozuobunengyonglihuashengengde,yeyingyongchutouhuotiexianshenwafandi,duicaidiyaoshefajiahouhuotuceng,zaimeiyicishiyongguojifeihou,douyaoshenfan30厘米以上並充分攪拌,以增加土層之間的上下交換,增強土壤的蓄水保墒能力。(六)生物修複。在嚴格控製汙染物排放,合理施用農藥、化(hua)肥(fei)的(de)前(qian)提(ti)下(xia),對(dui)於(yu)已(yi)經(jing)汙(wu)染(ran)的(de)土(tu)壤(rang)主(zhu)要(yao)采(cai)用(yong)生(sheng)物(wu)修(xiu)複(fu)方(fang)式(shi)進(jin)行(xing)治(zhi)理(li),對(dui)工(gong)業(ye)汙(wu)染(ran)嚴(yan)重(zhong)的(de)土(tu)壤(rang),可(ke)種(zhong)植(zhi)羊(yang)齒(chi)類(lei)等(deng)一(yi)些(xie)吸(xi)收(shou)重(zhong)金(jin)屬(shu)能(neng)力(li)強(qiang)的(de)植(zhi)物(wu)。蚯(qiu)蚓(yin)能(neng)提(ti)高(gao)土(tu)壤(rang)自(zi)淨(jing)能(neng)力(li),還(hai)能(neng)處(chu)理(li)固(gu)體(ti)廢(fei)物(wu)。積(ji)極(ji)推(tui)廣(guang)使(shi)用(yong)降(jiang)解(jie)農(nong)藥(yao)汙(wu)染(ran)的(de)微(wei)生(sheng)物(wu)菌(jun)劑(ji),也(ye)可(ke)以(yi)減(jian)少(shao)農(nong)藥(yao)的(de)殘(can)留(liu)量(liang)。
一、惡化表現現 (一)土(tu)壤(rang)板(ban)結(jie)。在(zai)蔬(shu)菜(cai)栽(zai)培(pei)中(zhong)大(da)量(liang)施(shi)用(yong)無(wu)機(ji)化(hua)肥(fei),忽(hu)視(shi)有(you)機(ji)肥(fei)的(de)作(zuo)用(yong)及(ji)補(bu)充(chong),致(zhi)使(shi)土(tu)壤(rang)中(zhong)有(you)機(ji)質(zhi)匱(kui)乏(fa),透(tou)氣(qi)性(xing)差(cha),好(hao)氣(qi)性(xing)微(wei)生(sheng)物(wu)活(huo)性(xing)降(jiang)低(di),土(tu)壤(rang)腐(fu)熟(shu)化(hua)緩(huan)慢(man),板(ban)結(jie)堅(jian)硬(ying),循(xun)環(huan)不(bu)暢(chang),阻(zu)礙(ai)了(le)蔬(shu)菜(cai)值(zhi)物(wu)根(gen)係(xi)的(de)正(zheng)常(chang)伸(shen)展(zhan)。(二)鹽漬化嚴重。由於對菜地過量施用含氯化肥,或者長期用含鹽分高的水澆灌,使得土壤中鹽離子增多,pH值升高,鹽漬化加重,易形成生理幹旱,產生鹽離子毒害作用,抑製蔬菜的生長和發育。(三)微量元素缺乏。菜地往往多年連作,長年不補施有機肥料,又沒有補充施用微肥的習慣,結果使土壤中的鋅、硼、鉬、銅、錳等微量元素日漸減少,影響蔬菜的健康成長。(四)土(tu)壤(rang)活(huo)土(tu)層(ceng)變(bian)薄(bo)。連(lian)茬(cha)套(tao)作(zuo),人(ren)工(gong)翻(fan)耕(geng),大(da)水(shui)漫(man)灌(guan),未(wei)用(yong)機(ji)械(xie)深(shen)翻(fan),不(bu)進(jin)行(xing)深(shen)翻(fan)犁(li)耕(geng),這(zhe)些(xie)耕(geng)作(zuo)方(fang)式(shi)會(hui)令(ling)土(tu)壤(rang)活(huo)土(tu)層(ceng)變(bian)薄(bo)變(bian)淺(qian),致(zhi)使(shi)活(huo)土(tu)層(ceng)中(zhong)根(gen)係(xi)無(wu)法(fa)平(ping)展(zhan)深(shen)入(ru)。移(yi)栽(zai)時(shi)帶(dai)過(guo)大(da)的(de)土(tu)球(qiu),更(geng)是(shi)容(rong)易(yi)令(ling)活(huo)土(tu)層(ceng)變(bian)薄(bo)變(bian)貧(pin)瘠(ji)。(五)土壤病蟲累積。大麵積的種植,品種單一的連作,不科學的管理,均會造成土壤中病原菌、害蟲逐年累積,不斷增多,對蔬菜的危害日趨加重,常常造成根係腐爛,甚至會整株枯死。(六)土壤汙染。土壤汙染是由汙水灌溉、酸雨、向土壤傾倒固體廢物和過量施用化肥農藥等造成的。土壤汙染具有隱蔽、滯後、累積、不可逆轉和難於治理等特點。土壤被汙染後,最終導致生態係統的全麵退化。
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