植物生长剂和固沙剂对民勤沙区植被生长的影响

 为探讨植物生长调节剂、固沙剂的保水、增产及其固沙效果,挽救濒临死亡的地表植被,修复地区生态平衡,在民勤干旱沙区开展了有关应用技术研究。结果表明:1)植物生长调节剂及固沙剂具有一定的保水能力,可使农田作物含水率（耕作层）提高1.0～1.5百分点,使梭梭林分100cm内土壤层平均含水率提高2.3百分点,流动沙丘80cm内土壤层平均含水率提高3.5～3.9百分点。2)种子包衣制剂处理对小麦、玉米生长发育具有滞后作用,但均存在增产效果,能使小麦增产12.2%,玉米增产2.0%。3)利用液体试剂进行籽瓜灌根处理可促使植株较对照的主根增长9.1cm,主蔓增长33.0 cm,平均增产率为11.5%。4)用植物生长调节剂对退化植被梭梭、唐古特白刺进行根部追施后,梭梭新梢增长0.6～3.0 cm,唐古特白刺冠幅增大45.1～96.2 cm。5)固沙剂固定流动沙丘后,使沙丘结皮厚度增加0.2～0.3cm,风蚀减小50%～80%,沙丘植被盖度增加1.9%～2.7%。

Influence of plant growth regulator agent and sand-fixing agent on vegetable growth in Minqin desert area

A relative applied technique research is developed in Minqin desert area to probe into the effect of water saving,increasing product and its sand fixing of plant growth regulator agent and sand-fixing agent and to save dying surface vegetation and restore regional ecological balance.The results indicated that plant growth regulator agent and sand-fixing agent have some moisture conservation ability to make the soil moisture content in tillage layer of farmland increase by 1.0%-1.5%.Average soil moisture content of forest land of Haloxylon Ammodendron of 100cm deep increase by 2.3% and that of shifting dunes of 80cm deep increase by 3.5%3.9%.The both growth of wheat and corn have been delayed by capsule seed treatment,but the yield of wheat increases by 12.2%,corn 2.0%.The growth and yield of seed melon with root treatment by the agent is larger than that of contrast ones,taproot growth increases by 9.1cm and main vine 33cm,average increased yield rate is 11.5%.After treatment on degraded vegetation's roots by plant growth regulator agent,the new shoot growth of Haloxylon Ammodendron could increase by 0.6-3.0cm and crown width of Nitraria sphaerocarpa has increase by 45.1-96.2cm.Through the sand-fixing agent treatment,thickness of sand crust in dune area has increased by 0.20.3cm than that of the natural crust,dune wind erosion is 0.5-0.8 times smaller than that of the natural dunes and vegetation coverage of dunes has increased by 1.9%-2.7% than that of natural dunes.