植物残体的化学组成及土壤水分条件对新形成腐殖质组成和性质的影响

EFFECTS OF CHEMICAL COMPOSITION OF PLANT TYPES AND SOIL WATER REGIME ON THE COMPOSITION AND PROPERTIES OF THE NEWLY FORMED HUMUS

1.在相同的腐解条件下,不同物料腐解产物的 C/有机 N 比值和 HA/FA 因物料种类而异。2.与旱地条件下的相比,田菁、草木樨、紫云英在水田条件下腐解产物的 C/有机N 比值较宽,而稻草和绿萍的则相反。3.土壤水分条件和植物残体的化学组成对腐解产物的氮素形态分布没有明显影响。4.在其它条件相同时,与旱地条件下的相比,渍水条件下腐解产物的 HA/FA 大多较宽,而胡敏酸的光密度(E_4)值则较小。

1.The C/org.N and HA/FA ratios of newly formed humus (NFH) varied with the chemical composition of plant types as materials.2.The humus formed by decay of Chinese milk vetch,sesbania and sweet clover under submerged conditions had a higher C/org.N ratio than that formed under upland conditions,while a contrary trend was observed in that produced from rice straw and azolla.3.Both chemical composition of plant types and soil water regime had no significant effects on the distribution of nitrogen forms of NFH.4. Keeping other factors constant,the humus formed under submerged conditions generally had a higher HA/FA ratio and a lower optical density (E_4) of HA than that formed under upland conditions.