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为研究砂田(GSMF)表面覆盖的砾石层对土壤微生物组成的影响,于2004年春布设试验,分别为砾石覆盖厚度试验、覆盖砾石粒径试验和不同粒径砾石按不同比例混合覆盖试验。于2009年5月对未经扰动的土壤细菌、真菌、放线菌组成和土壤含水量进行研究,土壤剖面深度分别为0～1cm、1～2cm、2～4cm和4～20cm。结果表明,砾石覆盖可以增加土壤含水量和土壤微生物数量,当土壤表面覆盖的砾石粒径越小或者组成覆盖层的砾石以小粒径为主时,有利于土壤水分的积累和细菌的生长,反之则利于放线菌的生长,粒径范围在1～8cm时,较利于真菌生长,在砾石覆盖厚度试验中观察到有超过50%的真菌分布在0～1cm深的土壤剖面中这一特有现象。砾石层覆盖厚度为7～9cm时,最适宜微生物生长。
In order to study the effect of gravel layer covered by sand surface (GSMF) on the composition of soil microorganisms, we put the tests in the spring of 2004, which are the gravel coverage thickness test, the gravel size coverage test and the graded gravels with different proportions. In May 2009, the undisturbed soil bacteria, fungi, actinomycetes composition and soil moisture were studied. The depth of soil profiles were 0-1 cm, 1-2 cm, 2-4 cm and 4-20 cm, respectively. The results showed that gravel coverage could increase the soil water content and the amount of soil microorganisms. When the gravel covered by the soil surface was smaller or the gravel covered by the covering layer was dominated by small grain size, it would be beneficial to soil water accumulation and bacterial growth. The other is conducive to the growth of actinomycetes, particle size range of 1 ~ 8cm, more conducive to the growth of fungi, gravel cover thickness test was observed in more than 50% of the fungi distributed in 0 ~ 1cm depth of the soil profile of this unique phenomenon. Gravel layer covering the thickness of 7 ~ 9cm, the most suitable microbial growth.