[土壤] 土壤含水量
The soil moisture content and leaf area index (LAI) are the critical factors in energy partition process.
在平衡過程中，土壤含水量和葉面積指數（LAI）是決定能量分配的關鍵因素。
There are close correlations among leaf and stolon moisture content and their cytoplasm electrolyte leakage rate, and the soil moisture content.
葉片與匍匐莖含水量、電解質外滲率與土壤含水量之間呈顯著和極顯著相關；
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溫度、二氧化碳和土壤水分含量對光合速率的影響；
The optimum soil moisture content index about tomato seedling bed irrigation was conducted out in early spring .
對番茄早春育苗的苗床灌溉最佳土壤含水量上限數值進行了試驗研究。
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.
對于東亞飛蝗來說，土壤含水量對飛蝗産卵地選擇、蝗卵的發育和孵化等有直接影響；
The results showed that nitrification process is directly related with soil moisture content and forms of N fertilizer.
灌淤土施氮後土壤硝态氮含量變化與土壤含水量及氮肥種類有關。
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.
論述了檢查法（少量、多次擇伐法）不同作業方式對長白山北部雲冷杉林下枯落物、土壤含水量及枯落物分解速率的影響。
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.
試驗和分析表明，兩種灌水方式下的棉花生長對土壤水分環境的要求是一緻的。
The relationship between soil moisture content, slope position and time can be expressed through a binary cubic polynomial.
檸條地土壤儲水量與坡面位置和時間的關系可用一個二元三次多項式來表達。
It is difficult to indicate spatial variability of soil moisture content at large area by conventional methods.
遙感技術的出現為實現大範圍地區土壤水分含量的實時或準實時動态監測提供了可能性。
Soil moisture content and its dynamics on road embankment and cutting slope at fixed points were investigated on Shaanxi—Inner Mongolia desert expressway.
采用定位取樣法研究了陝蒙沙漠高速公路路堤和路塹邊坡土壤水分的季節變化。
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.
結果顯示：濕潤鋒運動速度和土壤含水率的變化速度都是由快逐漸減慢，所形成的濕潤區近似一個球冠體；
The increment of B. subtilis number varied with soil moisture content, and decreased in the order of 23%\u003e17%\u003e28%. The interaction of C.
不同含水量條件對細菌的增殖促進作用總體表現為23%含水量處理\u003e17%含水量處理\u003e28%含水量處理。
The experiments of soil moisture content in different fields have been done by soil moisture fast-measurement instrument.
使用土壤水分快速測量裝置，在北京郊區進行了不同面積、大樣本的田間墒情測量。
The soil moisture content of different Cistanche deserticola excavation hole treatments existed significant differences.
肉苁蓉采挖坑不同處理方式之間的土壤含水率存在顯著差異。
Soil moisture content of Larch stand with furrowing soil preparation is 16.95% and is 2.9% higher than normal soil preparation.
開溝整地方式的落葉松林分中土壤含水率為16.95%，比常規整地的高出2.9個百分點；
The results showed that soil moisture content, normal load, load dwelling time, and their interactions had important influence on the soil adhesion.
研究結果表明：在所考察的試驗因素中，含水量對粘附力的影響最大，其次為土壤載荷和載荷作用時間。
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.
為探索土壤含水率在微地域上的分布，采用根系與非根系定點取樣和方差分析的方法，分析了長白落葉松幼林林地土壤的含水率微地域分布情況。
The soil moisture content of all soil layers were increased, but the increasing extent was different.
不同土層的土壤含水量都有所增加，但增加幅度不完全一緻；
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.
當前土壤水分是預測、估算并建立重要生态模型過程，例如水分的蒸散發、傳輸過程、地表徑流以及地下水補給等的一個重要的參數；
The results of semi-variance analysis reveal that the soil moisture content and salt content are correlated in a certain spatial range.
通過結構分析，發現土壤水分和鹽分在一定範圍内存在空間相關性。
The percentage of soil moisture content and surface residual coverage jointly influence the quantity of wind erosion.
土壤含水率和地表殘茬覆蓋共同影響着土壤的風蝕量。
And the effects of soil condition , soil moisture content and sample depth in fault gas measurement were discussed also.
并讨論了土質、土壤、含水量、取樣深度等對斷層氣氡測量的影響。
Therefore, increasing the soil moisture content is the main ecological way to decrease the degree of decline in photosynthesis at midday.
因此，增加土壤水分是減緩光合午間降低程度的主要生态途徑。
The adjustable packer was designed, and its pressure could be adjusted by spring according to the soil moisture content.
設計了可調鎮壓器，可根據土壤含水率不同，適當調節鎮壓強度。
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.
結果表明，在各個土層中，兩種林分下的土壤含水量、pH值、有機碳的含量以及微生物生物量磷均無顯著差異。
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統計軟件進一步對土壤水分與土層深度的關系進行拟合，結果表明土壤水分與土層深度的關系具有極強的相關性，其關系方程為拟和三次抛物線型。
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.
結果表明，幹旱區内陸河流域土壤的退化主要表現為幹旱化、鹽漬化和土壤肥力的退化。
土壤含水量（Soil Moisture Content） 指單位質量土壤中所含的水分質量，通常以質量百分比表示。它是土壤物理學和農業科學的核心參數，反映土壤的濕度狀态，直接影響植物生長、灌溉管理、生态系統平衡及地質災害預警等。其标準定義公式為：
$$ theta_m = frac{M_w}{M_s} times 100% $$ 其中 $theta_m$ 為土壤質量含水量（%），$M_w$ 是土壤中水分的質量，$M_s$ 為烘幹後的幹土質量。
農業灌溉指導
土壤含水量是确定作物灌溉時機和用水量的關鍵指标。當含水量低于作物需水的臨界值時需及時補水，避免幹旱脅迫；過高則可能導緻根系缺氧。聯合國糧農組織（FAO）指出，精準監測可提升水資源利用率30%以上 （來源：FAO灌溉指南）。
氣候與生态研究
作為地表能量平衡的重要變量，土壤水分影響地表蒸散發和熱量交換，關聯區域降水模式及碳循環過程。美國國家航空航天局（NASA）通過衛星遙感（如SMAP任務）全球監測土壤濕度以研究氣候變化 （來源：NASA SMAP任務頁）。
地質災害預警
持續降雨後土壤含水量飽和是滑坡、泥石流的主要誘因。中國地質調查局将實時土壤濕度數據納入地質災害預警模型，提升預警準确率 （來源：自然資源部地質災害技術規範）。
該參數的科學管理對保障糧食安全、應對極端氣候及防災減災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，通常以重量或體積的百分比表示。它是描述土壤濕度的重要指标，廣泛應用于農業、環境科學、工程和氣候研究等領域。以下是詳細解釋：
重量含水量（Gravimetric Water Content）：指單位質量幹土中水分的質量占比，計算公式為： $$ text{重量含水量} = frac{text{濕土質量} - text{幹土質量}}{text{幹土質量}} times 100% $$ 通過烘幹法（105°C烘幹至恒重）測量，是實驗室常用方法。
體積含水量（Volumetric Water Content）：指單位體積土壤中水分的體積占比，公式為： $$ text{體積含水量} = frac{text{水的體積}}{text{土壤總體積}} times 100% $$ 常用于實地監測，如傳感器和遙感技術。
如需進一步了解具體測量步驟或應用案例，可參考土壤學教材或相關行業标準（如ASTM D2216）。
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