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我国水稻土几乎遍布全国,南起海南岛,北至黑龙江,西起西藏,东到台湾都有水稻土的分布.但主要分布在秦岭—淮河以南,其中以长江中下游平原、四川盆地、珠江三角洲和台湾西部平原最为集中.总面积可达2600万公顷,约占谷物总面积的28.4%,而产量约占谷物总产量的43.3%.但是,水稻单产极不平衡,低的只有2～3吨/公顷,而高的可达10吨/公顷以上.其变化幅度主要取决于生物气候条件,栽培技术以及土壤肥力水平及其管理等.其中土壤物理条件及其管理亦为重要因素.如沉板水稻土的土壤颗粒组成中粗粉粒(直径0.05～0.01毫米)可达50%,在
China’s paddy soil is almost all over the country, south Hainan Island, north of Heilongjiang, Tibet from west, east of Taiwan have paddy soil distribution, but mainly distributed in the Qinling Mountains - south of the Huaihe River, among them the middle and lower reaches of the Yangtze River plain, Sichuan Basin, The Pearl River Delta and Taiwan’s western plains are the most concentrated with a total area of 26 million hectares, accounting for 28.4% of the total cereal area and the output accounting for 43.3% of the total cereal output. However, rice yields are extremely unbalanced with only 2 ~ 3 tons per hectare, and up to 10 tons per hectare or more, the rate of change depends mainly on the bioclimatic conditions, cultivation techniques and soil fertility levels and their management, among which the soil physical conditions and their management are also important factors such as The sediment paddy soil soil particle composition coarse grain (diameter 0.05 ~ 0.01 mm) up to 50%, in the