[土壤] 土壤含水量
The soil moisture content and leaf area index (LAI) are the critical factors in energy partition process.
在平衡过程中，土壤含水量和叶面积指数（LAI）是决定能量分配的关键因素。
There are close correlations among leaf and stolon moisture content and their cytoplasm electrolyte leakage rate, and the soil moisture content.
叶片与匍匐茎含水量、电解质外渗率与土壤含水量之间呈显著和极显著相关；
In the canopy photosynthesis submodel, the effect of temperature, carbon dioxide and soil moisture content are taken into account.
在光合作用中引入了温度、二氧化碳和土壤水分含量对光合速率的影响；
The optimum soil moisture content index about tomato seedling bed irrigation was conducted out in early spring .
对番茄早春育苗的苗床灌溉最佳土壤含水量上限数值进行了试验研究。
For Oriental migratory locust soil moisture content has direct impact to site selection for egg lay of the locusts, and their egg development and hatching.
对于东亚飞蝗来说，土壤含水量对飞蝗产卵地选择、蝗卵的发育和孵化等有直接影响；
The results showed that nitrification process is directly related with soil moisture content and forms of N fertilizer.
灌淤土施氮后土壤硝态氮含量变化与土壤含水量及氮肥种类有关。
The article stu***s the effects on spruce fir forests′ litter and soil moisture content and litters′ decomposing rate under different management system in north Changbai Mountains.
论述了检查法（少量、多次择伐法）不同作业方式对长白山北部云冷杉林下枯落物、土壤含水量及枯落物分解速率的影响。
By using two selected indexes of drought diagnosis, the soil moisture content suitable for growing crop and the crop water stress index (CWSI) were evaluated.
试验和分析表明，两种灌水方式下的棉花生长对土壤水分环境的要求是一致的。
The relationship between soil moisture content, slope position and time can be expressed through a binary cubic polynomial.
柠条地土壤储水量与坡面位置和时间的关系可用一个二元三次多项式来表达。
It is difficult to indicate spatial variability of soil moisture content at large area by conventional methods.
遥感技术的出现为实现大范围地区土壤水分含量的实时或准实时动态监测提供了可能性。
Soil moisture content and its dynamics on road embankment and cutting slope at fixed points were investigated on Shaanxi—Inner Mongolia desert expressway.
采用定位取样法研究了陕蒙沙漠高速公路路堤和路堑边坡土壤水分的季节变化。
The results showed the moisture front movement speed and the soil moisture content variation rate all was gradually reduced and one approximate ball-crown body moisture area was formed.
结果显示：湿润锋运动速度和土壤含水率的变化速度都是由快逐渐减慢，所形成的湿润区近似一个球冠体；
The increment of B. subtilis number varied with soil moisture content, and decreased in the order of 23%\u003e17%\u003e28%. The interaction of C.
不同含水量条件对细菌的增殖促进作用总体表现为23%含水量处理\u003e17%含水量处理\u003e28%含水量处理。
The experiments of soil moisture content in different fields have been done by soil moisture fast-measurement instrument.
使用土壤水分快速测量装置，在北京郊区进行了不同面积、大样本的田间墒情测量。
The soil moisture content of different Cistanche deserticola excavation hole treatments existed significant differences.
肉苁蓉采挖坑不同处理方式之间的土壤含水率存在显著差异。
Soil moisture content of Larch stand with furrowing soil preparation is 16.95% and is 2.9% higher than normal soil preparation.
开沟整地方式的落叶松林分中土壤含水率为16.95%，比常规整地的高出2.9个百分点；
The results showed that soil moisture content, normal load, load dwelling time, and their interactions had important influence on the soil adhesion.
研究结果表明：在所考察的试验因素中，含水量对粘附力的影响最大，其次为土壤载荷和载荷作用时间。
In this paper, the distribution of soil moisture content on different ravines of Larix olgensis young stand was stu***d with root -near sample, non -root -near sample and variance analysis.
为探索土壤含水率在微地域上的分布，采用根系与非根系定点取样和方差分析的方法，分析了长白落叶松幼林林地土壤的含水率微地域分布情况。
The soil moisture content of all soil layers were increased, but the increasing extent was different.
不同土层的土壤含水量都有所增加，但增加幅度不完全一致；
The soil moisture content plays an essential role in predicting, estimating ard modeling major ecological processes such as evaporation, transpiration, surface runoff and ground water replenishment.
当前土壤水分是预测、估算并建立重要生态模型过程，例如水分的蒸散发、传输过程、地表径流以及地下水补给等的一个重要的参数；
The results of semi-variance analysis reveal that the soil moisture content and salt content are correlated in a certain spatial range.
通过结构分析，发现土壤水分和盐分在一定范围内存在空间相关性。
The percentage of soil moisture content and surface residual coverage jointly influence the quantity of wind erosion.
土壤含水率和地表残茬覆盖共同影响着土壤的风蚀量。
And the effects of soil condition , soil moisture content and sample depth in fault gas measurement were discussed also.
并讨论了土质、土壤、含水量、取样深度等对断层气氡测量的影响。
Therefore, increasing the soil moisture content is the main ecological way to decrease the degree of decline in photosynthesis at midday.
因此，增加土壤水分是减缓光合午间降低程度的主要生态途径。
The adjustable packer was designed, and its pressure could be adjusted by spring according to the soil moisture content.
设计了可调镇压器，可根据土壤含水率不同，适当调节镇压强度。
Results showed that there were no significant differences in soil total organic carbon, soil moisture content, pH and soil microbial biomass phosphorus in each soil layer between the two plantations.
结果表明，在各个土层中，两种林分下的土壤含水量、pH值、有机碳的含量以及微生物生物量磷均无显著差异。
With SPSS software to simulate the relationship between soil moisture content and soil depth, the correlation was obvious and the equation type was cubic parabola curve.
用SPSS统计软件进一步对土壤水分与土层深度的关系进行拟合，结果表明土壤水分与土层深度的关系具有极强的相关性，其关系方程为拟和三次抛物线型。
The results show that the soil degradation in arid inland river basins in northwest China is mainly reflected by the reduction of soil moisture content and soil fertility as well as soil salinization.
结果表明，干旱区内陆河流域土壤的退化主要表现为干旱化、盐渍化和土壤肥力的退化。
土壤含水量（Soil Moisture Content） 指单位质量土壤中所含的水分质量，通常以质量百分比表示。它是土壤物理学和农业科学的核心参数，反映土壤的湿度状态，直接影响植物生长、灌溉管理、生态系统平衡及地质灾害预警等。其标准定义公式为：
$$ theta_m = frac{M_w}{M_s} times 100% $$ 其中 $theta_m$ 为土壤质量含水量（%），$M_w$ 是土壤中水分的质量，$M_s$ 为烘干后的干土质量。
农业灌溉指导
土壤含水量是确定作物灌溉时机和用水量的关键指标。当含水量低于作物需水的临界值时需及时补水，避免干旱胁迫；过高则可能导致根系缺氧。联合国粮农组织（FAO）指出，精准监测可提升水资源利用率30%以上 （来源：FAO灌溉指南）。
气候与生态研究
作为地表能量平衡的重要变量，土壤水分影响地表蒸散发和热量交换，关联区域降水模式及碳循环过程。美国国家航空航天局（NASA）通过卫星遥感（如SMAP任务）全球监测土壤湿度以研究气候变化 （来源：NASA SMAP任务页）。
地质灾害预警
持续降雨后土壤含水量饱和是滑坡、泥石流的主要诱因。中国地质调查局将实时土壤湿度数据纳入地质灾害预警模型，提升预警准确率 （来源：自然资源部地质灾害技术规范）。
该参数的科学管理对保障粮食安全、应对极端气候及防灾减灾具有不可替代的作用。
"Soil moisture content"（土壤含水量）是指土壤中所含的水分比例，通常以重量或体积的百分比表示。它是描述土壤湿度的重要指标，广泛应用于农业、环境科学、工程和气候研究等领域。以下是详细解释：
重量含水量（Gravimetric Water Content）：指单位质量干土中水分的质量占比，计算公式为： $$ text{重量含水量} = frac{text{湿土质量} - text{干土质量}}{text{干土质量}} times 100% $$ 通过烘干法（105°C烘干至恒重）测量，是实验室常用方法。
体积含水量（Volumetric Water Content）：指单位体积土壤中水分的体积占比，公式为： $$ text{体积含水量} = frac{text{水的体积}}{text{土壤总体积}} times 100% $$ 常用于实地监测，如传感器和遥感技术。
如需进一步了解具体测量步骤或应用案例，可参考土壤学教材或相关行业标准（如ASTM D2216）。
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