Since the 1950s,numerous soil and water conservation measures have been implemented to control severe soil erosion in the Liuhe River Basin(LRB),China.While these measures have protected the upstream soil and water ec...Since the 1950s,numerous soil and water conservation measures have been implemented to control severe soil erosion in the Liuhe River Basin(LRB),China.While these measures have protected the upstream soil and water ecological environment,they have led to a sharp reduction in the downstream flow and the deterioration of the river ecological environment.Therefore,it is important to evaluate the impact of soil and water conservation measures on hydrological processes to assess long-term runoff changes.Using the Soil and Water Assessment Tool(SWAT)models and sensitivity analyses based on the Budyko hypothesis,this study quantitatively evaluated the effects of climate change,direct water withdrawal,and soil and water conservation measures on runoff in the LRB during different periods,including different responses to runoff discharge,hydrological regime,and flood processes.The runoff series were divided into a baseline period(1956-1969)and two altered periods,i.e.,period 1(1970-1999)and period 2(2000-2020).Human activities were the main cause of the decrease in runoff during the altered periods,contributing 86.03%(-29.61 mm),while the contribution of climate change was only 13.70%(-4.70 mm).The impact of climate change manifests as a decrease in flood volume caused by a reduction in precipitation during the flood season.Analysis of two flood cases indicated a 66.00%-84.00%reduction in basin runoff capacity due to soil and water conservation measures in the upstream area.Soil and water conservation measures reduced the peak flow and total flood volume in the upstream runoff area by 77.98%and 55.16%,respectively,even with nearly double the precipitation.The runoff coefficient in the reservoir area without soil and water conservation measures was 4.0 times that in the conservation area.These results contribute to the re-evaluation of soil and water conservation hydrological effects and provide important guidance for water resource planning and water conservation policy formulation in the LRB.展开更多
延胡索是我国传统中药材中的常用大宗药材之一,产地多且适应性强,其中浙江省为其主要的道地产区之一.延胡索生产中多采用自繁自种的无性繁殖,易产生种质退化等问题,导致其产量和品质良莠不齐.采用基因条形码ITS2序列检测技术、田间延胡...延胡索是我国传统中药材中的常用大宗药材之一,产地多且适应性强,其中浙江省为其主要的道地产区之一.延胡索生产中多采用自繁自种的无性繁殖,易产生种质退化等问题,导致其产量和品质良莠不齐.采用基因条形码ITS2序列检测技术、田间延胡索性状记录及高效液相色谱分析等技术,对浙江省3个主要品种来源的延胡索浙胡1号(YHS-1)、浙胡2号(YHS-2)和延胡索3号(农户自保种,YHS-3)进行延胡索的基源鉴定、田间性状分析和主要苄基异喹啉型生物碱的含量分析,以筛选浙江地区延胡索的优良品种.基源鉴定数据结果显示,YHS-2与延胡索Corydalis Yanhusuo W. T. Wang(NCBI编号MH260617.1和MH260618.1)的亲缘关系较近,YHS-3次之,而YHS-1亲缘关系较远.田间数据结果显示,与另外2个品种相比,YHS-2具有花多且密,花期短以及块茎产量高的优良生产性状.建立6种苄基异喹啉型生物碱的快速检测方法分析3个品种中生物碱的含量.结果显示,YHS-2中各生物碱的含量显著优于YHS-1和YHS-3(p<0.05).表明3个品种中YHS-2更为适合浙江地区的生存环境,可作为目前延胡索浙江栽培的优质品种推广种植和使用.展开更多
基金Fundamental Research Funds for the Central Universities(ZY20230206)Langfang City Science and Technology Research and Development Plan Self-raised Funds Project(2023013216).
文摘Since the 1950s,numerous soil and water conservation measures have been implemented to control severe soil erosion in the Liuhe River Basin(LRB),China.While these measures have protected the upstream soil and water ecological environment,they have led to a sharp reduction in the downstream flow and the deterioration of the river ecological environment.Therefore,it is important to evaluate the impact of soil and water conservation measures on hydrological processes to assess long-term runoff changes.Using the Soil and Water Assessment Tool(SWAT)models and sensitivity analyses based on the Budyko hypothesis,this study quantitatively evaluated the effects of climate change,direct water withdrawal,and soil and water conservation measures on runoff in the LRB during different periods,including different responses to runoff discharge,hydrological regime,and flood processes.The runoff series were divided into a baseline period(1956-1969)and two altered periods,i.e.,period 1(1970-1999)and period 2(2000-2020).Human activities were the main cause of the decrease in runoff during the altered periods,contributing 86.03%(-29.61 mm),while the contribution of climate change was only 13.70%(-4.70 mm).The impact of climate change manifests as a decrease in flood volume caused by a reduction in precipitation during the flood season.Analysis of two flood cases indicated a 66.00%-84.00%reduction in basin runoff capacity due to soil and water conservation measures in the upstream area.Soil and water conservation measures reduced the peak flow and total flood volume in the upstream runoff area by 77.98%and 55.16%,respectively,even with nearly double the precipitation.The runoff coefficient in the reservoir area without soil and water conservation measures was 4.0 times that in the conservation area.These results contribute to the re-evaluation of soil and water conservation hydrological effects and provide important guidance for water resource planning and water conservation policy formulation in the LRB.
文摘延胡索是我国传统中药材中的常用大宗药材之一,产地多且适应性强,其中浙江省为其主要的道地产区之一.延胡索生产中多采用自繁自种的无性繁殖,易产生种质退化等问题,导致其产量和品质良莠不齐.采用基因条形码ITS2序列检测技术、田间延胡索性状记录及高效液相色谱分析等技术,对浙江省3个主要品种来源的延胡索浙胡1号(YHS-1)、浙胡2号(YHS-2)和延胡索3号(农户自保种,YHS-3)进行延胡索的基源鉴定、田间性状分析和主要苄基异喹啉型生物碱的含量分析,以筛选浙江地区延胡索的优良品种.基源鉴定数据结果显示,YHS-2与延胡索Corydalis Yanhusuo W. T. Wang(NCBI编号MH260617.1和MH260618.1)的亲缘关系较近,YHS-3次之,而YHS-1亲缘关系较远.田间数据结果显示,与另外2个品种相比,YHS-2具有花多且密,花期短以及块茎产量高的优良生产性状.建立6种苄基异喹啉型生物碱的快速检测方法分析3个品种中生物碱的含量.结果显示,YHS-2中各生物碱的含量显著优于YHS-1和YHS-3(p<0.05).表明3个品种中YHS-2更为适合浙江地区的生存环境,可作为目前延胡索浙江栽培的优质品种推广种植和使用.
