不同覆沙厚度下松嫩平原盐碱裸地上的种植效果

松嫩平原土地盐碱化严重限制了当地农牧业的可持续发展,覆沙并在覆沙层种植作物是盐碱化土地的有效利用途径.为此在松嫩平原盐碱裸地上进行不同厚度覆沙(10、20、30、40 cm),并连续2年分别种植玉米(Zea mays)、向日葵(Helianthus annuus)、大麦(Hordeum vulgare)及苜蓿(Medi...

Effects of different sand-cover thicknesses on crops in bare saline-alkali land in the Songnen Plain

The salinization of the Songnen Plain seriously restricts the sustainable development of farming and animal husbandry.Sand-covering and planting crops on the sand layer are effective methods to utilize salinized land.To study the effects of different sand-cover thicknesses on different crops,maize,sunflower,barley,and alfalfa were planted on bare saline-alkaline land with sand-cover thicknesses of 10,20,30,and 40 cm in the Songneng Plain.All four crops grew normally in the first year after sand-covering but grew weakly at the settlement stage.In the second year,all four crops grew powerfully.Sand-cover of over 20 cm significantly promoted maize growth.Maize yield was 4298 kg·ha?1 with sand-cover of 40 cm,which was 2.5 times higher than that with sand-cover of 10 cm(P<0.05).The hay yield and total root biomass of alfalfa were the highest with sand-cover of 30 cm,and reached 8597 and 3367 kg·ha?1,respectively;these were 3.36 and 1.28 times higher than those with sand-cover of 10 cm(both P<0.05).The yields of sunflower and barley were highest with sand-cover of 40 cm;these were 33.4%and 269.5%higher than those with sand-cover of 10 cm,respectively.However,there were no significant differences among sand-cover thicknesses of 20 cm,30 cm,and 40 cm.Therefore,maize should be planted with sand-cover of more than 20 cm,alfalfa with sand-cover of 30 cm,and sunflower and barley with sand-cover of 40 cm.The results show that these crops can be grown successfully by sand-covering in saline-alkali land.