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life zone 生物帶。

life-and-death

For rotor steel ( 30crlmolv steel ) , the tests of low - cycle fatigue property are done under different temperatures . the fatigue life under different temperatures is researched to make up for the defects of the testing for foreign similar materials . when pull - stretch data is attempted to evaluate low - cycle fatigue data , the result shows that four - point associated method in middle - low life zone is done well under room temperature , but there are large errors of four - point associated method and general - slope method under other temperatures 在本文中,通過與國外同類材料的性能進行比較,國產材料與國外材料共有的材料特征基本相同;對轉子鋼( 30crlmolv鋼)進行了不同溫度下的低周疲勞性能實驗,研究其在不同溫度下疲勞壽命,以彌補國外對同類鋼材測試的不足;采用拉伸數據預測低周疲勞壽命時發現,室溫條件下用四點關聯法在中低壽命區預測較好,在高溫條件下四點關聯法和通用斜率法都有較大誤差,需要進行改進。

This paper synthetically summarized current research on terrestrial nitrogen cycle and soil nitrogen cycle , meanwhile , uncertainties of terrestrial nitrogen cycle were discussed . the global diversified ecosystem nitrogen and carbon storage was comparative thoroughly estimated through different life zone . the global organic nitrogen storage was estimate by the c / n ratio Post等按照不同生物帶比較全面的估算了全球各種生態系統類型的土壤碳氮密度和含量, mcelroy等利用土壤有機碳儲量和碳氮比來估算了全球土壤有機氮儲量。

Boreal life zone 北方生物帶

Alleghenian life zone 阿萊干尼生物區

Austroriparian life zone 南方針葉林帶

Arid transition life zone 干旱過渡生物帶