Effects of N Forms and Rates on Vegetable Growth and Nitrate Accumulation

Experiments were carried out on a vegetable field with Peking cabbage(Brassica pekinensis (Lour.) Rupr.), cabbage (Brassica, chinensis var. oleifcra Makino and nemoto),green cabbage (Brassica chinensis L.), spinach (Spinacia oleracea L.) and rape(Brassica campestrisL.) to study the effects of N forms and N rates on their growth and nitrate accumulation. Theresults indicated that application of ammonium chloride, ammonium nitrate, sodium nitrate and ureasignificantly increased the yields and nitrate concentrations of Peking cabbage and spinach.Although no significant difference was found in the yields after application of the 4 N forms,nitrate N increased nitrate accumulation in vegetables much more than ammonium N. The vegetableyields were not increased continuously with N rate increase, and oversupply of N reduced the plantgrowth, leading to a yield decline. This trend was also true for nitrate concentrations in somevegetables and at some sampling times. However, as a whole, the nitrate concentrations in vegetableswere positively correlated with N rates. Thus, addition of N fertilizer to soil was the major causefor increases in nitrate concentrations in vegetables. Nitrate concentrations were much higher inroots, stems and petioles than in blades at any N rate.

Impact of climate and human activity on NDVI of various vegetation types in the Three-River Source Region, China

The Three-River Source Region(TRSR)in China holds a vital position and exhibits an irreplaceable strategic importance in ecological preservation at the national level.On the basis of an in-depth study of the vegetation evolution in the TRSR from 2000 to 2022,we conducted a detailed analysis of the feedback mechanism of vegetation growth to climate change and human activity for different vegetation types.During the growing season,the spatiotemporal variations of normalized difference vegetation index(NDVI)for different vegetation types in the TRSR were analyzed using the Moderate Resolution Imaging Spectroradiometer(MODIS)-NDVI data and meteorological data from 2000 to 2022.In addition,the response characteristics of vegetation to temperature,precipitation,and human activity were assessed using trend analysis,partial correlation analysis,and residual analysis.Results indicated that,after in-depth research,from 2000 to 2022,the TRSR's average NDVI during the growing season was 0.3482.The preliminary ranking of the average NDVI for different vegetation types was as follows:shrubland(0.5762)>forest(0.5443)>meadow(0.4219)>highland vegetation(0.2223)>steppe(0.2159).The NDVI during the growing season exhibited a fluctuating growth trend,with an average growth rate of 0.0018/10a(P<0.01).Notably,forests displayed a significant development trend throughout the growing season,possessing the fastest rate of change in NDVI(0.0028/10a).Moreover,the upward trends in NDVI for forests and steppes exhibited extensive spatial distributions,with significant increases accounting for 95.23%and 93.80%,respectively.The sensitivity to precipitation was significantly enhanced in other vegetation types other than highland vegetation.By contrast,steppes,meadows,and highland vegetation demonstrated relatively high vulnerability to temperature fluctuations.A further detailed analysis revealed that climate change had a significant positive impact on the TRSR from 2000 to 2022,particularly in its northwestern areas,accounting for 85.05%of the total area.Meanwhile,human activity played a notable positive role in the southwestern and southeastern areas of the TRSR,covering 62.65%of the total area.Therefore,climate change had a significantly higher impact on NDVI during the growing season in the TRSR than human activity.

Effects of Seedling Cultivation Methods on Seedling Cultivation of Major Vegetables

Objective] The alm was to expIore the effects of cuItivation methods on vegetabIe growth in seedIing stage. [Method] The test incIuded 4 treatments, as foI-Iows： treatment 1 （T1） where seedIings were cuItivated as per water fiIm-based cuI-tivation and irrigation proceeded reguIarIy; treatment 2 （T2） where irrigation proceed-ed continuousIy as per water fiIm-based cuItivation; treatment 3 （T3） where seedIings were cuItivated as per fIoating nursing; controI treatment （CK） where seedIings were cuItivated as per seedIing-tray cuItivation in order to survey the number of germinated seedIings per tray. [Result] Both of water fiIm-based cuItiva-tion and fIoating nursing took advantages in germination speed and aduIt seedIing rate, compared with tray cuItivation method. [Conclusion] Water fiIm-based cuItivation and fIoating nursing make innovations in water management during seedIing cuItiva-tion, which improve germination speed, aduIt seedIing rate and seedIing quality, making contribution to Iarge-scale production of greenhouse vegetabIes through ap-pIications and practices.

Replacement of Dietary Fish Oil with Vegetable Oils Improves the Growth and Flesh Quality of Large Yellow Croaker(Larmichthys crocea)

We investigated the effect of the replacement of dietary fish oil with vegetable oils on the growth and flesh quality of large yellow croaker(Larmichthys crocea). The basal diet(FO) was formulated to contain 66.5% fish meal and 6.4% menhaden fish oil; whereas the other 3 experimental diets were formulated by replacing the fish oil with 50% soybean oil(SO50), 100% soybean oil(SO100) and 100% palm oil(PO100), respectively. The 4 diets were randomly assigned to 4 floating sea cages(3.0 m × 3.0 m × 3.0 m), and each was stocked with 250 fish individuals with an initial average weight of 245.29 g ± 7.45 g. The fish were fed to apparent satiation twice a day at 5:00 and 17:00, respectively, for 12 weeks. Experimental analysis showed that the specific growth rate of fish fed SO50 or PO100 were significantly higher than that of fish fed FO or SO100(P<0.05), and crude lipid contents of ventral muscle and viscera were significantly lower in fish fed FO than in those fed the other 3 diets(P<0.05). No significant differences in condition factor, viscerosomatic index, hepatosomatic index, gutted yield and colorimetric values of fish among the dietary treatments were observed(P>0.05). Compared to FO diet, SO50, SO100 and PO100 diets led to substantial decreases in the liquid loss and water loss from fresh fillets(1 d, 4℃)(P<0.05). Similarly, thiobarbituric acid reactive substance(TBARS) values of fillets under different storage conditions(1 d, 4℃; 7 d, 4℃; 4 weeks,-20℃; 8 weeks,-20℃) decreased significantly after partial or complete replacement of fish oil with vegetable oils. These findings indicated that the growth performance and selected flesh quality properties(liquid holding capacity and TBARS value) of large yellow croaker were substantially improved by replacing dietary fish oil with vegetable oils.

Dynamic monitoring of soil bulk density and infiltration rate during coal mining in sandy land with different vegetation

To investigate the effects of coal mining on soil physical properties,sandy lands with three major vegetation types(Salix psammophila,Populus simonii,and Artemisia ordosica)were investigated by the ring knife method and double-ring infiltrometer.Specifically,variations in soil bulk density and water infiltration rate and the influences of coal mining and vegetation type on the properties during different subsidence stages were studied at the Shendong Bulianta mine.The results showed that,in the period before mining,soil bulk density occurred in the order A.ordosica>P.simonii>S.psammophila,with a negative correlation between the initial infiltration rate and steady infiltration rate being observed.In the period during mining and 3 months after mining,there were no significant differences in soil bulk density and water infiltration rate among vegetation types.At 1 year after mining,the soil bulk density occurred in the order A.ordosica>S.psammophila>P.simonii,having a negative correlation with the steady infiltration rate.The water infiltration depths of the S.psammophila,P.simonii and A.ordosica were 50,60,and 30 cm,respectively.The infiltration characters were simulated by the Kostiakov equations,and the simulated and experimental results were consistent.Linear regression revealed that vegetation types and soil bulk density had significant effects on soil initial infiltration rate during the four study periods,and the infiltration rate of the period 1 year after mining was mainly influenced by the soil bulk density of the period before mining.The results indicated that vegetation types had significant effects on soil bulk density,and that the tree-shrub-grass mode was better than one single plantation for water conversation and vegetation recovery in sandy land subjected to mining.

Assessment on Energy Self-Sufficiency Rate for Building Integrated Photovoltaics and Fuel Cell System in Japan

A building integrated photovoltaic (PV) and fuel cell (FC) system is proposed for assessment of the energy self-sufficiency rate in a city in Japan. The electricity consumed in the building is mainly supplied by solar panels, while the gap between the energy demand and supply is solved by the FC that is powered by the H2 produced by water electrolysis with surplus power of PV. A desktop case study of using the proposed system in Tsu city which is located in central part of Japan, has been conducted. The results found that the self-sufficiency rates of PV system to electricity demand of households (RPV) during the daytime in April and July are higher than those in January and October. The results also reveal that the self-sufficiency rate of FC system to the electricity demand (RFC) is 15% - 38% for the day when the mean amount of horizontal solar radiation is obtained in January, April, July and October. In addition, it is found the optimum tilt angle of solar panel installed on the roof of the buildings should be 0 degree, i.e., placed horizontally.

PREPRARATION OF CoPcS/TiO_2/BEADS AND THEIR PHOTOCATALYTIC REACTIVITY FOR PHOTODEGRADATION OF VEGETABLE OIL FLOATING ON WATER

The paper introduces the preparation of floating TiO2/beads photocalyst attached to the hollow glass micro-beads surface by sol-gel technique using tetrabutyl titanate as material and the preparation of floating CoPcS/TiO2/beads by dip-coatig technique. The optimal factor of degradation of vegetable oil floating on water using CoPcS/TiO2/beads was studied. The result showed that the removal rate of vegetable oil floating on water can highly reach 90% at the optimal condition （acidity or neutrality, 375W medium-pressure mercury vapour lamp, illumination 2h-3h, lg CoPcS/TiO2/beads）. The photocatalytic removal efficiency causing by CoPcS/TiO2/beads was increased rapidly by adding a trace amount of H2O2.

Influence of rangeland protection and seasonal grazing on aboveground vegetation,forage quality and weight gain of small ruminants–a study in Thar Desert,Pakistan

The Thar Desert,Sindh,Pakistan is characterized by low productivity.Besides,economy is based on agriculture,livestock and mining,nevertheless,livestock graze freely on public and private land.The aim of this research was to determine biomass production and to evaluate the effects of continuous and seasonal grazing on protected and unprotected plots.A 45 ha protected rangeland area of Hurrabad in the Umerkot Thar desert was selected and divided into three blocks of 15 ha each.Blocks of the same size were also established in unprotected area.The data for vegetation biomass,canopy cover,forage nutrients and weight gain of animals in two seasons(spring and summer)was collected from both protected and unprotected sites.The results showed that biomass significantly increased in summer in both sites.However,the biomass values in protected sites were significantly higher.Similarly,the vegetation cover also seemed to increase in summer in both protected(90.7%±0.29%)and unprotected sites(39.2%±0.09%).The foliar concentrations of all nutrients varied significantly with season.The average final live-weight gain for does on the protected grazing sites during the 42-day period in spring and the 96 days after the monsoon was almost double that of does grazing on the unprotected site during 2016 and 2017(P<0.05).The study concludes that the protection of grazing lands during certain periods can lead to better production of vegetation and livestock and improve range conditions.

电动叶菜收获机速度协同控制系统设计与试验

针对电动叶菜收获机切割、输送和行走三者速度不协调导致的叶菜损伤率高、功耗大和收获效率低等问题,开发了一种电动叶菜收获机速度协同控制系统。系统以可编程逻辑控制器为核心,利用信息传感模块对割刀电机的电流、电压和转速进行数据采集;主控模块根据速度协同控制算法对采集信号进行处理,得到负载信息并协同切割、输送和行走三者速度。田间试验结果表明:系统稳定可靠,能够根据收获情况动态协同各部件速度参数,叶菜损伤率为8.88%;与传统定速控制方法相比,收获机功耗降低了13.1%,收获效率提升了33.4%。

全生物降解地膜对湖南不同地区果蔬生长的影响

针对塑料地膜使用造成土壤环境污染的问题,研究以白色/黑色全生物降解地膜和普通塑料地膜为参试材料,在湖南省长沙市、沅江市、汉寿县等地区开展了西瓜、莴苣、秋葵等作物的覆膜试验,探究全生物降解地膜对不同作物的生长、品质、产量及土壤性质等指标的影响,观察全生物降解地膜的降解情况。结果发现,两种全生物降解地膜对湖南各地区果蔬生产均起到提质增效的作用。沅江地区黑色降解地膜覆盖栽培西瓜,西瓜单瓜重增加25.8%,叶片数增加45.5%,显著高于未覆膜处理;覆盖白色降解地膜的秋葵叶片长度比对照高42.1%,叶片宽度比对照高55.9%,叶片数增加43.2%,产量增加55.5%。普通塑料地膜在作物收获后未能降解,白色和黑色全生物降解地膜的降解率分别为80.3%~90.7%和63.0%~80.3%。综合不同地区的试验结果,认为两种降解地膜均可作为普通塑料地膜的潜在替代品,具有较大的推广前景。

烟剂对大棚藜麦菜光合作用和叶绿素含量的影响

在藜麦菜的温室大棚种植中,用12%百菌清烟剂与12%速克灵烟剂防治病害较为常用。为了研究这两种烟剂对藜麦菜的叶绿素含量和光合作用的影响,施用烟剂后第3天和第5天分别进行藜麦菜叶片叶绿素含量和光合速率的检测。结果显示,施用烟剂可以提高藜麦叶绿素的含量,提高光合速率,进而提高生产率。

漂浮植被作用下水流纵向流速的垂向分布及离散特性研究

为探究漂浮植被影响下明渠水流流速及纵向离散系数的沿程变化特性,采用Fluent软件中的k-ε模型进行三维数值模拟并与水槽试验结果进行对比分析,在模型验证合理的基础上,对漂浮植被不同根系下探深度及覆盖率下水流纵向时均流速的垂向分布特性进行研究,并基于改进的分区模型分析了含漂浮植被明渠的纵向离散系数。结果表明:漂浮植被水流垂向上可分为含植被水流层、无植被水流层与近河床层。纵向流速最大值出现在无植被水流层,其大小与植被下探深度及覆盖率呈正相关。含植被水流层的纵向流速随植被根系下探深度和覆盖率的增加而减小,无植被水流层及近河床层的纵向流速随着下探深度和覆盖率的增大而增大,且植被覆盖率及下探深度越大含植被水流层与无植被水流层的流速差异越大。纵向离散系数沿程表现出先增大后减小的趋势,在植被区中下游离散最为剧烈,且与植被下探深度和覆盖率呈正相关。

广东省植被生态质量演变与气象条件贡献分析

植被生态质量体现了植被的生产功能、多样性和服务功能,其变化受气象条件和人类活动的共同影响,科学地评估植被变化的气象条件贡献率对区域生态修复和应对气候变化具有重要的意义。以广东省为例,基于中国气象局发布的NDVI、FVC、NPP和气象条件贡献率等数据,运用统计分析与空间分析方法,探讨了广东省植被生态质量的时空分布特征,并定量评估了气象条件对广东植被变化的贡献。结果表明:1)2001-2022年,广东省的NDVI、FVC和NPP均呈波动上升变化,三者的年平均变化范围分别为0.494-0.627、0.594-0.706和C 831-1.15×103 g∙m^(-2),多年平均值分别为0.565、0.653和C 976 g∙m^(-2),峰值分别出现于2016年(NPP)、2021年(NDVI)、2022年(FVC),谷值出现于2005年(NDVI、FVC)和2003年(NPP);2)空间上,广东省植被生态质量存在明显的区域差异,表现为粤北>粤东北>粤西>粤东>珠三角,其中阳江、肇庆、云浮、清远、韶关等城市植被生态质量较好,东莞、佛山较差;3)近20多年来气象条件对广东省植被生态质量变化的影响以正贡献为主,气象条件贡献率整体以-1.60×10^(-2)/a的变化率呈波动下降趋势,气象条件对广东植被变化的影响总体变小;4)气象条件对粤北植被的影响以正向驱动为主,对粤东、粤西以负向驱动为主且对粤东的影响程度大于粤西,其中2007、2017-2018、2020-2022年气象条件对广东植被生态质量变化影响以负贡献为主,2022年呈高度负贡献。气象因素对广东植被生态质量变化的影响较大且存在明显的区域差异,在气象条件相对稳定的情况下,植被长势明显变好。

整合多源遥感数据的洪涝灾害评估恢复——以河南“7·20”暴雨灾害为例

洪涝灾害发生后通过植被指数和灯光指数定量评估灾后恢复情况,对灾区经济建设和生态恢复的评估具有重要科学意义。该文以河南“7·20”暴雨灾害区为研究区,基于日度和月度NPP-VIIRS数据、Sentinel-NDVI、MODIS-EVI数据和统计年鉴数据,构建归一化差异城市指数(normalized difference urban index,NDUI)来表征城市内部空间细节;基于回归模型模拟人口和国内生产总值的空间分布;从研究区的夜间灯光数据和植被覆盖数据2个不同的维度来评估洪涝灾害。结果表明:高危区和中危区总面积为1429.04 km^(2),占研究区总面积的6.06%,高危地区主要分布在郑州西部、新乡东部、安阳东部、鹤壁北部,其中郑州市受灾严重程度最高;从植被覆盖度恢复率(vegetation cover recovery rate,VCRR)来看,卫辉市、淇县、滑县、林州市等地区整体植被恢复情况较差,其VCRR的值大部分在0以下,植被覆盖有恶化趋势。NDUI与社会经济统计数据拟合精度高于0.8,表明NDUI可以在洪涝灾害发生后应用于精确位置救援和灾后针对性重建工作;NPP-VIIRS和MODIS-EVI评估洪涝灾害的结果具有很好的互补性,2种数据的有机结合进行洪涝灾害研究,对灾后救援和恢复评估均有较高的应用价值。

河岸缓冲带植被配置对径流水中磷的截留效果

[目的]研究不同配置缓冲带对径流水中磷素截留效果的影响,为选择适宜太湖河岸缓冲带和有效治理富营养化提供参考。[方法]以7块大小为20 m×40 m的太湖人工林河岸缓冲带为研究对象,比较不同宽度(15、30、40 m)、不同植被类型(‘南林95’杨、中山杉林、‘南林95’杨-中山杉混交林)、不同林分密度(400、1000、1600株·hm^(−2))的河岸缓冲带对径流水中总磷和可溶性磷的截留效果的差异。[结果](1)冬季缓冲带对径流水中总磷和可溶性磷的拦截效果明显优于春季缓冲带;缓冲带对径流水中可溶性磷的截留率显著高于总磷。(2)不同的河岸缓冲带对宽度的需求不同。对于中山杉林、混交林、400和1000株·hm^(−2)的杨树林而言,15 m宽的河岸缓冲带基本能满足截磷需求;1600株·hm^(−2)的杨树林需要40 m以上的河岸缓冲带宽度才能满足对磷的截留要求(3)对于中山杉林和杨树林缓冲带而言,林分密度为400株·hm^(−2)的缓冲带对径流水中总磷和可溶性磷的截留效果最好。(4)中山杉林缓冲带对径流水中磷素的截留效果优于中山杉-杨树混交林和杨树林缓冲带,中山杉可作为太湖流域河岸缓冲带构建的首选植物。[结论]15 m宽400株·hm^(−2)的中山杉林缓冲带对径流水中磷素的截留能达到最大效果。

施氮量对麦后复种不同蔬菜模式土壤养分及产量的影响

【目的】通过研究施氮量对麦后复种不同蔬菜模式下土壤特性及蔬菜产量的影响,为宁夏灌区麦后复种氮肥合理高效利用提供理论依据。【方法】以麦后复种娃娃菜(小义和秋)、辣椒(娇龙7号)、萝卜(心里美)为材料,采用裂区设计,主区为3种复种蔬菜,娃娃菜(A)、辣椒(B)、萝卜(C),副区为4个施氮水平:0(N_(1))、180 kg/hm^(2)(N_(2))、225 kg/hm^(2)(N_(3))、270 kg/hm^(2)(N_(4)),通过作物生长及土壤相关指标测定,研究了不同施氮量在3种复种模式下对土壤养分及蔬菜产量的影响。【结果】适量增施氮肥有利于提高土壤碱解氮、速效磷和有机质含量,其在N_(3)处理下的含量均显著高于其他处理(P<0.05);速效钾、含水量和容重则随施氮量增加有所下降;复种模式对土壤养分的影响表现为为娃娃菜>萝卜>辣椒;各复种蔬菜产量随施氮量的增加变化不同,辣椒和萝卜产量随施氮量增加呈抛物线型变化,N_(3)处理下值最高分别为1095.19 kg/667m^(2)、9006.24 kg/667m^(2),较其他处理分别显著提高71.64%~199.44%、21.22%~143.97%,娃娃菜产量随施氮量增加而持续增加,N_(4)处理下值最高达8205.60 kg/667m^(2),较其他处理显著提高39.03%~314.89%。【结论】适宜的施氮量能有效改善土壤性状、促进养分循环与增加、提高蔬菜产量,适宜宁夏灌区麦后复种的施氮量为225 kg/hm^(2)。

Association Mapping for Drought Tolerance of Rice (Oryza sativa L.) at Vegetative Stage

[Objective] This study aimed to identify possible quantitative trait loci (QTL) for vegetative drought tolerance traits of rice (Oryza sativa L.). [Method] A total of 184 rice genotypes were field screened and 156 SSR markers randomly distributed at each 3 Mb bin were used through genome-wide scanning method and association analysis to detect QTLs for vegetative drought tolerance traits leaf rolling (LER), leaf drying (LED) and drought recovery rate (DRR). [Result] The experimental rice genotypes showed varied response under vegetative drought, LER, LED and DRR were highly correlated. Population structure was detected at K=3 and K=7, certain extent of admixture existed in the experimental rice genotypes, relative kinship of the rice genotypes ranged from 0 to 0.924 5. Significant linkage disequilibrium among SSR markers was detected. Sixteen SSR markers have been detected to be associated with vegetative drought tolerance traits, four for LER, eight for LED and four for DDR. Most of the markers were associated with more than one trait, indicating a single mechanism might involve in expression of several related traits, i.e. osmotic adjustment. RM107 (Chr.9) was associated with all the three traits and fell exactly within or closely nearby to previous reported regions, was a major QTL for vegetative drought tolerance, RM477 (Chr.8) was significantly associated with DRR and extremely significantly associated with LER was probably another major QTL for vegetative drought tolerance. [Conclusion] Association mapping is a very effective method for describing complex traits like drought tolerance.

适宜氮磷钾用量和配比协同促进盆栽牡丹营养和生殖生长

【目的】牡丹是我国著名的木本观赏植物,施肥不平衡严重影响盆栽牡丹的生长和观赏效果。研究开花前后氮、磷、钾不同施用量和配施比例对盆栽牡丹生长的影响,确定适宜的氮、磷、钾施用量及配比,为盆栽牡丹精准施肥提供理论依据。【方法】本研究以5年生牡丹‘紫二乔’为供试材料,采用“3414”不完全正交回归设计进行盆栽试验,结合隶属函数法评价牡丹的生长状况,利用肥料效应模型拟合牡丹植株的综合隶属函数值与施肥量之间的数学关系,得出牡丹最佳生长的氮、磷、钾肥推荐施肥量。【结果】牡丹开花前后施用氮磷钾肥显著影响植株株高、茎粗、冠幅、花径和单株花数(P<0.05),适宜氮磷钾用量和配比促进盆栽牡丹营养和生殖生长的协同提高。氮、磷、钾三因素配合处理的牡丹综合隶属函数值均大于缺素处理,缺素处理又大于无肥处理,N_(2)P_(2)K_(2)处理的综合隶属函数值(0.73)是N_(0)P_(0)K_(0)的3.17倍。氮磷钾对牡丹综合生长的影响表现为氮>磷>钾。氮、磷、钾肥对牡丹营养和生殖生长存在明显交互作用,任一肥料水平的过量或不足均会抑制牡丹植株生长,降低观赏效果。采用一元二次、二元二次、三元二次肥料效应函数方程拟合牡丹的综合隶属函数值和施肥量,二者相关性均达显著水平,综合各肥料效应函数方程的推荐用量及相应的综合隶属函数值,得出牡丹开花前后氮(N)、磷(P_(2)O_(5))、钾(K_(2)O)的最优推荐施肥量分别为4.21、2.07、2.52 g/株,适宜的氮、磷、钾施肥比例为1∶0.49∶0.60。【结论】开花前后施用适量的氮、磷、钾肥可提高牡丹的农艺性状,促进牡丹的营养和生殖生长协同提高。氮、磷、钾的最优推荐施肥量为4.21、2.07、2.52 g/株,适宜的氮、磷、钾施肥比例为1∶0.49∶0.60。

水库底泥应用于绿化用土的潜在可行性研究

选用居民饮用水水库中的底泥作为绿化用土,经检测得知底泥中的有害成分低于《绿化种植土壤》(CJ/T340-2016)。水库底泥经烘干破碎后过40目标准筛网,掺加陶粒和椰糠,在是否掺入有机肥的因素下设计两组正交实验,同时以含水率为51%~60%的湿水库底泥直接掺入作为对照实验,分别种植小白菜、矮脚黄和五月慢。根据3种蔬菜的生长发芽时间,观察记录蔬菜4 d的发芽数、8 d蔬菜种子的存活发芽率。实验结果表明水库底泥经烘干破碎预处理后,掺入有机肥更有利于蔬菜种子发芽,其中小白菜的生长发芽情况最好,8 d平均存活发芽率为85.6%,五月慢次之,为65.5%。而含水率为51%~60%的湿水库底泥,混合有机肥,蔬菜种子的存活发芽率不超过60%。实验证明了蔬菜种子可以在水库底泥中存活,居民饮用水水库中的底泥可以应用于绿化用土。