摘要
甘肃民勤西沙窝属阿拉善地块南缘凹陷带,自然植被稀疏,植物种类贫乏,组成以灌木、小灌木为主的荒漠植被,该荒漠植被可以分为4个植被型,10个群系组,19个群系。植物群落对土壤理化性状及土壤养分转化的影响都很显著。苦豆子+芦苇群落,胡杨林和盐爪爪+红砂群落,植物体吸收营养元素量和土壤肥力呈强反相关,r=-0.9986,y=5.376-0.785x;白刺群落、红柳群落和沙蒿+沙米群落的土壤母质都是流沙,植物体吸收营养元素量和土壤肥力呈强正相关,r=0.7556,y=1.0706+0.7059x,白刺对氮素的吸收量,土壤中累积的全氮量,0～30厘米土层氮元素矿化率以及磷、钙、钾、镁元素分别较红砂、沙蒿要高0.63～2.70倍。
The western sandland in Minqin County is within the hollow belt of the southern Arasan region. The sparse natural vegetation and a few plant species show desert vegetation form consisting of the shrub and small shrub. All vegetation are divided into 4 vegetation forms, 10 formation groups and 19 formations. Plant community has a great influence upon the physicochemical properties of soil and nutrient inversion. Foxtail-like Sophora (Sophora alopecuroides)+Common Reed (Phragmites communis) community, Diversifolious Poplar (Populus diversifolia ) community, Slenderbranch Kalidium (Kalidium gracile)+Songory Reaumuria (Reaumuria soongrica) community show inverse correlation between the nutrient absorption and soil fertility, r=-0.9986, y=5.376-0.785x. Siberian Nitrarian (Nitraria sibirica) community, Branchy Tamarisk (Tamarix ramosissima) community and Roundhead Wormwood (Artemisia sphaerocephala)+Squarrose Agriophyllure (Agriophyllum squarrosura) community are distributed on the fluid sand dune, so the positive correlation is presented between the nutrient absorption and soil fertility, r=0.7556, y=1.07506+0.7059x, The nitrogen absorption amount, the total nitrogen mineralizing rate in 0～30 cm soil horizon and phosphorus, calcium, potassium, magnesium content of the Nitraria community are about 0.63～2.70 times higher than those of Songory Reaumuria and Roundhead wormwood community.
出处
《甘肃农业大学学报》
CAS
CSCD
1989年第4期67-76,共10页
Journal of Gansu Agricultural University
关键词
荒漠
土壤分析
植被
土壤理化性状
desert
vegetation
community
physicochemical properties of soil
