免耕留茬秸秆覆盖对河西走廊荒漠化土壤改土培肥效应的研究

在荒漠化土壤上进行了免耕留茬秸秆覆盖、免耕留茬、传统土壤耕作的田间比较试验。结果表明,免耕留茬秸秆覆盖对河西走廊荒漠化土壤农田生态环境具有良好的影响。免耕留茬秸秆覆盖与传统土壤耕作比较,0~20cm耕层土壤全盐、孔隙度、pH分别降低1.86g/kg、5.28%和0.32;团粒结构,自然含水量,土壤贮水量分别增加72.5g/kg、32.95g/kg和111.98m3/hm2;玉米产量、产值、利润分别增加1.95t/hm2、1600元/hm2和600元/hm2;增产率达21.56%;土壤有机质、全N、速效N、P、K和CEC亦随之增加。

EFFECTS OF NON-TILLAGE AND MULCHING ON SOIL BUILDING OF DESERTIFIED SOIL IN THE HEXI CORRIDOR

Field experiments on desertified soil in the Hexi Corridor were carried out to compare soil building effects between Treatment I (non-tillage leaving stubbles mulching with straws), Treatment II (non-tillage leaving stubbles) and Treatment III (traditional farming produce). Results showed that Treatment I had the best soil building effect, reducing total salt, porosity and pH of the plow layer (0 ~ 20 cm) by 1.86 g/kg, 5.28 % and 0.32, respectively and increasing aggregate structure, natural moisture and moisture holding capacity of the soil by 72.5 g/kg, 32.95 g/kg and 111.98 m3/hm2, respectively and yield, output value and profit of the crop of corn by 1.95 t/hm2 or 21.56 %, 1600 yuan/hm2 and 600 yuan/hm2, respectively. Besides, its soil organic matter, total N, readily available N, readily available P, readily available K and CEC all increased correspondingly.