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一、问题的提出建三江管局平均1～2年一小涝,3～4年一大涝。涝灾是这里的主要灾害。国家虽然已投资搞水利工程,但只能排除地表水,壤中过饱和水仍无法排除。其原因除白浆土自身固有的质地粘重,渗透能力差等不良特性外,主要是人为造成的。建三江农管局主要是铧式犁耕翻,其优点是翻土扣垡能力强,对垦荒及地表残株较多的土地较适应,而对占70～75%的熟化土壤就不适宜。常年用铧式犁耕翻,犁铲、犁床给耕层以下的土壤(多为白浆层)以很大的挤压力。久而久之,形成一层厚8～15厘米几乎不透水的犁底层,其容重达1.5～
First, the issue put forward Jian3 Jianjiang an average of 1 to 2 years a small floods, 3 to 4 years a flood. Flooding is the main disaster here. Although the state has invested in water conservancy projects, it can only rule out surface water and supersaturated water in the soil can not be excluded. The reason is mainly caused by man-made, except for the intrinsic properties of white soil itself such as sticky texture and poor penetrating ability. Jian Sanjiang Agricultural Authority is the main type of plowing plowing, the advantage of soil buckle 垡 ability, reclamation and land more stubborn land more adapted to 70 to 75% of the maturity of the soil is not appropriate. Perennial use of plow plow, plow shovel, plow bed to the soil below the plow (mostly white layer) with a lot of pressure. Over time, the formation of a layer of 8 to 15 cm thick almost impermeable plow bottom, the weight of 1.5 ~