Numerous studies support that biodiversity predict most to ecosystem functioning,but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied.We i...Numerous studies support that biodiversity predict most to ecosystem functioning,but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied.We investigated 398 samples of the phytoplankton phosphorus resource use efficiency(RUE_(P)=chlorophyll-a concentration/dissolved phosphate)across two seasons in nine plateau lakes in Yunnan Province,China.We identified the main contributors to phytoplankton RUEP and analyzed their potential influences on RUEP at different lake trophic states.The results showed that total nitrogen(TN)contributed the most to RUEP among the nine lakes,whereas community turnover(measured as community dissimilarity)explained the most to RUEP variation across the two seasons.Moreover,TN also influenced RUEP by affecting biodiversity.Species richness(SR),functional attribute diversity(FAD2),and dendrogram-based functional diversity(FDc)were positively correlated with RUEP in both seasons,while evenness was negatively correlated with RUEP at the end of the rainy season.We also found that the effects of biodiversity and turnover on RUEP depended on the lake trophic states.SR and FAD2 were positively correlated with RUEP in all three trophic states.Evenness showed a negative correlation with RUEP at the eutrophic and oligotrophic levels,but a positive correlation at themesotrophic level.Turnover had a negative influence on RUEP at the eutrophic level,but a positive influence at the mesotrophic and oligotrophic levels.Overall,our results suggested that multiple factors and nutrient states need to be considered when the ecosystem functioning predictors and the biodiversityecosystem functioning relationships are investigated.展开更多
We select 34 representative agricultural listed companies as the study object,to analyze the characteristics of quick assets in agricultural companies.The ratio between quick assets and total assets roughly displays n...We select 34 representative agricultural listed companies as the study object,to analyze the characteristics of quick assets in agricultural companies.The ratio between quick assets and total assets roughly displays normal distribution,with the peak value up to 40%;the distribution figure shape of the ratio between quick assets and liquid asset displays normal distribution,with the peak value up to 63%.Taking the case of typical agricultural company,Yuan Longping High-Tech Agriculture Co.,Ltd.,we analyze the factors influencing turnover of quick assets,and the main factors influencing the turnover of quick assets in agricultural companies are monetary funds and receivables.We establish the multiple linear regression model,and draw the conclusion that the turnover efficiency of quick assets is significantly affected by the ratio between cash assets and income,turnover rate of receivables,and quickness ratio.展开更多
基金supported by the National Natural Science Foundation of China (Nos.42001099, 42071131)the Special Project for Social Development of Yunnan Province (No.202103AC100001)the Yilong Lake Administration (No.FDZBHH2021039-1)
文摘Numerous studies support that biodiversity predict most to ecosystem functioning,but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied.We investigated 398 samples of the phytoplankton phosphorus resource use efficiency(RUE_(P)=chlorophyll-a concentration/dissolved phosphate)across two seasons in nine plateau lakes in Yunnan Province,China.We identified the main contributors to phytoplankton RUEP and analyzed their potential influences on RUEP at different lake trophic states.The results showed that total nitrogen(TN)contributed the most to RUEP among the nine lakes,whereas community turnover(measured as community dissimilarity)explained the most to RUEP variation across the two seasons.Moreover,TN also influenced RUEP by affecting biodiversity.Species richness(SR),functional attribute diversity(FAD2),and dendrogram-based functional diversity(FDc)were positively correlated with RUEP in both seasons,while evenness was negatively correlated with RUEP at the end of the rainy season.We also found that the effects of biodiversity and turnover on RUEP depended on the lake trophic states.SR and FAD2 were positively correlated with RUEP in all three trophic states.Evenness showed a negative correlation with RUEP at the eutrophic and oligotrophic levels,but a positive correlation at themesotrophic level.Turnover had a negative influence on RUEP at the eutrophic level,but a positive influence at the mesotrophic and oligotrophic levels.Overall,our results suggested that multiple factors and nutrient states need to be considered when the ecosystem functioning predictors and the biodiversityecosystem functioning relationships are investigated.
文摘We select 34 representative agricultural listed companies as the study object,to analyze the characteristics of quick assets in agricultural companies.The ratio between quick assets and total assets roughly displays normal distribution,with the peak value up to 40%;the distribution figure shape of the ratio between quick assets and liquid asset displays normal distribution,with the peak value up to 63%.Taking the case of typical agricultural company,Yuan Longping High-Tech Agriculture Co.,Ltd.,we analyze the factors influencing turnover of quick assets,and the main factors influencing the turnover of quick assets in agricultural companies are monetary funds and receivables.We establish the multiple linear regression model,and draw the conclusion that the turnover efficiency of quick assets is significantly affected by the ratio between cash assets and income,turnover rate of receivables,and quickness ratio.
