爱了吗
发表于 2025-3-28 17:14:40
Dale W. Colel models are proposed that incorporate these features while preserving the desirable aspects of the traditional Boolean model. An empirical study conducted on four large patent corpora demonstrates that these hybrid models provide better access to the corpus of patents than the traditional Boolean model.
CREST
发表于 2025-3-28 19:57:40
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Small-Intestine
发表于 2025-3-29 01:13:45
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变态
发表于 2025-3-29 05:39:11
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profligate
发表于 2025-3-29 07:44:36
Soil nutrient supply in natural and managed forestsrevailing processes in the soil system, but subject to overriding human influence. Over relatively short periods of time, the soil nutrient supply can be subject to seasonal fluctuations. Factors affecting long-term nutrient availability are functions of soil mineralogy, the rate of mineralization o
慌张
发表于 2025-3-29 12:14:18
Nitrogen mineralization and potential nitrification at different depths in acid forest soils was almost complete at a depth of 10–50 cm, where the pH (H.O) was 4.1–4.5. Addition of CaCO. stimulated nitrification in the humus layer, indicating the presence of acid-sensitive nitrifiers, while nitrification in the mineral soil was sometimes stimulated and sometimes inhibited by the addition o
兴奋过度
发表于 2025-3-29 18:37:17
Nitrogen supply rate in Scots pine (, L.) forests of contrasting slope aspecthrough litter layers was 14–17 kg N·ha.·yr., and represented a high proportion of N supply rate. Organic-N leached through litter layers (27.8–37.0 kg N·ha.·yr.) was higher than leached inorganic-N. However, in most cases organic-N did not represent a high proportion of changes in soluble organic-N
挥舞
发表于 2025-3-29 21:38:06
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lymphedema
发表于 2025-3-30 03:16:18
Does nitrogen availability control rates of litter decomposition in forests?ous N availability on rates of litter decomposition..The influence of endogenous N availability on rates of litter decomposition was examined in a microcosm experiment. Lodgepole pine (. var. . Engelm.) needle litter collected from N-fertilized trees (525 kg N ha. in ammonium nitrate) were 5 times r
homeostasis
发表于 2025-3-30 05:19:24
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