生态垫和覆袋沙障对梭梭林冠下土壤含水量的影响

受沙障影响,梭梭冠下土壤含水量及分布会出现不同差异,探讨梭梭林冠下土壤水分受沙障影响的分布规律,可以为提高梭梭存活率,防风固沙提供理论依据。以民勤县老虎口生态垫沙障和覆袋沙障布设区的梭梭林及裸沙丘上的梭梭林(对照区)为研究对象,在沙障布设区及对照区各选取3株具有代表性的梭梭,在其东西南北向上各水平取土至80 cm,(部分情况下取土至60 cm处)每20 cm 1个梯度。垂直取土至60 cm,每10 cm 1个梯度。然后测定土壤水分。结果表明:(1)沙障的布设削弱了沙障内梭梭冠下土壤含水量,对照区梭梭冠下土壤含水量大于2种沙障布设区,差异性显著(P0.05),但2种沙障布设区的梭梭冠下土壤含水量差异性不显著(P0.05);(2)覆袋沙障在出现破损后,会削弱沙障内梭梭的土壤含水量;(3)布设有生态垫沙障的梭梭根部土壤含水量较丰富,越往外围土壤含水量越少。

Influence of Sand Barriers with Eco-mat and Sandbag on Soil Moisture Under Canopy of Haloxylon ammodendron Bge

Affected by the sand barrier, soil moisture and distribution under canopy of Haloxylon ammodendron Bge have differences. To discuss the distribution law of soil moisture under canopy of Haloxylon ammodendron Bge can improve the survival rate of Haloxylon ammodendron Bge forest and provide theoretical basis for wind prevention and sand fixation. Objects of the study were Haloxylon ammodendron Bge forest having sand barriers with eco-mat, sandbag layout area and bare sand dunes (CK) at Laohukou located in the Minqin Country. 3 representative plants of Haloxylons ammodendron Bge were chosen from sand barriers layout area and bare sand dunes respectively. The samples of soil to 80 cm distance (some soil samples to 60 cm) from the plant in the horizontal of east, west, south and north were taken respectively, every 20 cm as a gradient. The samples of soil to 60 cm in vertical position were taken with every 10 cm as a gradient, and the indexes of soil water were measured. The results showed that: soil moisture under canopy of Haloxylon ammodendron Bge was weakened by the barriers, soil moisture under canopy of Haloxylon ammodendron Bge in CK was greater than that under the two kinds of sand barriers, which had significant difference (P<0.05). But the soil moisture with the two kinds of sand barriers had no significant difference (P>0.05). Moreover, the damage of sandbag weakened the soil moisture of Haloxylon ammodendron Bge within sand barriers. The roots soil covered with eco-mat barriers had rich water content, but the water moisture became less with the increase of the distance.