There's unpredictable weather, changes in soil quality, and the ever-present possibility that pests and diseases may pay a visit.
天气不可预测，土壤质量发生变化，害虫和疾病随时都可能出现。
Soil biological and biochemical variables are considered to be essential to measure changes in soil quality.
土壤生物化学性质是重要的监测土壤变化的参数。
Soil enzyme activity varied obviously with duration of vegetable plantation and could be cited as a sensitive indicator of changes in soil quality.
不同利用年限菜地土壤酶活性变化幅度较大，能够更为敏感的指示土壤质量的变化。
Soil microorganisms is important to maintain the components of soil quality can be sensitive to reflect changes in soil quality, soil quality assessment is an important biological indicators.
土壤微生物是维持土壤质量的重要组分，能敏感地反映土壤质量的变化，是土壤质量评价的一个重要的生物学指标。
When land use patterns changed, changes in soil quality were embodied in content of organic matter, soil water holding and supplying capacity, soil structure and soil microbial characteristics.
在土地利用方式变化过程中，土壤质量变化体现在有机质含量、土壤供持水能力、土壤结构状况和土壤微生物特性的变化上。
Soil quality changes in a larger environment, soil type and environmental pollutants increase in the volume of the geographical scale and gradually expand further hardly.
土壤环境质量变化较大，土壤环境污染物种类和数量不断增加，发生的地域和规模在逐渐扩大，危害也进一步深入。
The influence of fire on water is indirectly manifested in that the post fire changes of vegetation, ground cover, soil and environment affect water cycle, water quality and aquatic lives.
火对水分的影响间接地表现在火后植被，地被物、土壤和环境的变化会影响水分循环、水质和水生生物。
The results showed: There were apparent changes of physical properties and nutrition content in the evolution process of city soil quality.
结果表明：城市土壤演变过程中土壤物理性质和养分含量发生了明显的变化。
The results showed: There were apparent changes of physical properties and nutrition content in the evolution process of city soil quality.
结果表明：城市土壤演变过程中土壤物理性质和养分含量发生了明显的变化。
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