本研究以牛轭草[Murdannia loriformis(Hassk.)Rolla Rao et Kammathy]为试验材料,通过不同量的氮磷钾施肥的处理,探讨和分析了牛轭草成坪有关形态及生理指标的变化。结果表明:(1)牛轭草的盖度随施肥处理时间的延长而逐渐增加,不同量的...本研究以牛轭草[Murdannia loriformis(Hassk.)Rolla Rao et Kammathy]为试验材料,通过不同量的氮磷钾施肥的处理,探讨和分析了牛轭草成坪有关形态及生理指标的变化。结果表明:(1)牛轭草的盖度随施肥处理时间的延长而逐渐增加,不同量的施肥处理的牛轭草盖度均高于CK对照处理,且存在显著差异;(2)除氮4水平施肥处理与CK处理分蘖数少且无显著差异外,其他施肥处理均比CK处理分蘖数多,并存在显著差异;(3)各施肥处理下的叶绿素含量均高于CK处理,除了处理3(N_1P_3N_3)、4(N_1P_4N_4)、8(N_2P_4N_3)之外,其他施肥处理的叶绿素含量均与CK处理存在显著差异;(4)各施肥处理的地上部鲜重均比CK处理高,且除处理2、4、5、6、9、12、16之外,其余均与CK存在显著差异;(5)不同施肥量下牛轭草植株株高和叶宽均高于CK处理,但不存在显著差异。展开更多
The shipboard measurements of whitecap coverage(W)and the meteorological and oceanographic information from two cruises in the South China Sea and Western Pacific are explored for estimating W.This study aims at evalu...The shipboard measurements of whitecap coverage(W)and the meteorological and oceanographic information from two cruises in the South China Sea and Western Pacific are explored for estimating W.This study aims at evaluating how to im-prove the parameterizations of W while considering the effects of currents and swells on wave breaking.Currents indeed affect W in a way that winds with following currents can decrease W,whereas winds with opposing currents can increase W.Then,10-m wind speed over sea surface(U_(10))is calibrated by subtracting the current velocity from U_(10) when the propagating directions of winds and currents are aligned.By contrast,when the direction is opposite,U_(10) is calibrated by adding the parallel velocity com-ponent of the opposing current to U_(10).The power fits of W dependence on the U_(10)-related parameters of U_(10),friction velocity,wind sea Reynolds number in terms of this calibrated-U_(10) obtain better results than those directly fitted to U_(10).Different from the effect of currents on W,wind blowing along the crest line of swells may contribute to the increase in W.The conclusions suggest that U_(10) should be calibrated first before parameterizing W in areas with a strong current or some swell-dominant areas.展开更多
文摘本研究以牛轭草[Murdannia loriformis(Hassk.)Rolla Rao et Kammathy]为试验材料,通过不同量的氮磷钾施肥的处理,探讨和分析了牛轭草成坪有关形态及生理指标的变化。结果表明:(1)牛轭草的盖度随施肥处理时间的延长而逐渐增加,不同量的施肥处理的牛轭草盖度均高于CK对照处理,且存在显著差异;(2)除氮4水平施肥处理与CK处理分蘖数少且无显著差异外,其他施肥处理均比CK处理分蘖数多,并存在显著差异;(3)各施肥处理下的叶绿素含量均高于CK处理,除了处理3(N_1P_3N_3)、4(N_1P_4N_4)、8(N_2P_4N_3)之外,其他施肥处理的叶绿素含量均与CK处理存在显著差异;(4)各施肥处理的地上部鲜重均比CK处理高,且除处理2、4、5、6、9、12、16之外,其余均与CK存在显著差异;(5)不同施肥量下牛轭草植株株高和叶宽均高于CK处理,但不存在显著差异。
基金This work was financially supported by the Hebei Ag-ricultural University Research Project for Talented Schol-ars(No.YJ201835)the National Natural Science Foun-dation of China(No.41806028)+1 种基金the China Postdoctoral Science Foundation(No.2019M65206)the Funda-mental Research Funds for the Central Universities(No.N182303031).The efforts of the researchers who obtained and published the data adopted in this study are much appreciated.We thank the crew,scientists,and students in Dongfanghong 2 for the help in the process of collecting observation data.
文摘The shipboard measurements of whitecap coverage(W)and the meteorological and oceanographic information from two cruises in the South China Sea and Western Pacific are explored for estimating W.This study aims at evaluating how to im-prove the parameterizations of W while considering the effects of currents and swells on wave breaking.Currents indeed affect W in a way that winds with following currents can decrease W,whereas winds with opposing currents can increase W.Then,10-m wind speed over sea surface(U_(10))is calibrated by subtracting the current velocity from U_(10) when the propagating directions of winds and currents are aligned.By contrast,when the direction is opposite,U_(10) is calibrated by adding the parallel velocity com-ponent of the opposing current to U_(10).The power fits of W dependence on the U_(10)-related parameters of U_(10),friction velocity,wind sea Reynolds number in terms of this calibrated-U_(10) obtain better results than those directly fitted to U_(10).Different from the effect of currents on W,wind blowing along the crest line of swells may contribute to the increase in W.The conclusions suggest that U_(10) should be calibrated first before parameterizing W in areas with a strong current or some swell-dominant areas.
