土壤板结的原因是什么?

2025-01-23 06:22:16
推荐回答(4个)
回答1:

形成土壤板结的原因主要有以下7因素:

1.农田土壤质地太粘,耕作层浅。

粘土中的粘粒含量较多,加之耕作层平均不到500px,土壤中毛细管孔隙较少,通气、透水、增温性较差,下雨或灌水以后,容易堵塞孔隙,造成土壤表层结皮。

2.有机肥严重不足、秸秆还田量减少。

使土壤中有机物质补充不足,土壤有机质含量偏低、结构变差,影响微生物的活性,从而影响土壤团粒结构的形成,造成土壤的酸碱性过大或过小,导致土壤板结。1988.TV

3.塑料制品过多的投入。1988.TV

地膜和塑料袋等没有清理干净,在土壤中无法完全被分解,形成有害的块状物。我国每年随着生活垃圾进入填埋场的废塑料,占填埋垃圾重量的3%-5%,其中大部分是塑料袋垃圾,施入土壤中不易降解,造成土壤板结。

4.长期单一地偏施肥

严重不足,重氮轻磷钾,土壤有机质下降,腐殖质不能得到及时地补充,引起土壤板结和龟裂。

(1)氮火爆农化招商网过量施入:微生物的氮素供应增加1份,相应消耗的碳素就增加25份,所消耗的碳素来源于土壤有机质,有机质含量低,影响微生物的活性,从而影响土壤团粒结构的形成,导致土壤板结。

(2)磷肥过量施入:磷肥的磷酸根离子与土壤中钙、镁等阳离子结合形成难溶性磷酸盐,既浪费磷火爆农化招商网,又破坏了土壤团粒结构,致使土壤板结。

(3)钾肥过量施入:钾肥中的钾离子置换性特别强,能将形成土壤团粒结构的多阳离子置换出来,而一的钾离子不具有键桥作用,土壤团粒结构的键桥被破坏了,也就破坏了团粒结构,致使土壤板结。

5.镇压、翻耕等农耕措施导致上层土壤结构破坏。

由于机械耕作过深的影响,破坏了土壤团粒结构。而每年施入土壤中的只有部分被当季作物吸收利用,其余被土壤固定,形成大量酸盐沉积,造成土壤板结

6.有害物质的积累。

部分地方地下水和工业废水及有毒物质含量高,长期利用灌溉使有毒物质积累过量引起表层土壤板结。

7.风沙、暴雨水土流失

遇到风沙、暴雨后表土层细小的土壤颗粒被带走,使土壤结构遭到破坏而引起土壤板结。

土壤板结的主要危害有哪些?

1.根系能力下降

土壤板结的情况下,缺氧而导致根系活力下降,不能正常发育,植物根部细胞呼吸减弱,而氮素等营养又多以离子态存在,吸收时要耗细胞代谢产生的能量,呼吸减弱,故能量供应不足,影响养分的吸收。

2.导致缺素症

缺素症有时并不一定就是土壤中缺少这种元素,而是因为土壤板结、土壤酸碱度不适宜、或者是土壤水分供应不均衡等一系列问题引起的根部吸收能力下降导致的。

回答2:

土壤中有机质的降低,致使土壤板结。

回答3:

什么是盆栽土壤板结?板结造成的原因是什么?让我细细道来,养好花花草草很简单,多练习

回答4:

受潮啦😄

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