11个造林树种在京北荒滩应用固体水效果比较研究     

李一为  周心澄  张启生  汪明 《西北林学院学报》2007,22(2):91-93

以往研究表明,固体水能够提高造林成活率,特别在困难立地造林应用中已取得较好效果。为进一步选择应用固体水效果较好的树种,为今后困难立地造林树种选择提供参考,于2004年4月在北京市延庆县龙庆峡荒滩进行固体水多树种造林应用试验。通过分析树种成活率和相关生长指标,对比研究固体水多树种应用效果。结果表明,在荒滩造林绿化中,固体水能够提高各供试树种成活率和生长指标;银杏、旱柳、国槐、新疆杨、白榆、侧柏、刺槐、毛白杨和樟子松等9个树种应用固体水效果较好。  相似文献   

江苏海涂土壤盐分地球化学特征的初步研究   总被引：2，自引：0，他引：2  

方明  陈邦本  胡蓉卿 《土壤学报》1992,29(2):208-210

根据江苏海涂地区所做的大量分析数据,应用数理统计方法,对滨海盐土的盐分地球化学类型及其变化规律进行了定量的研究,分别提出盐分离子组成规律和盐分变化中几种离子当量比的特征值,为滨海盐土的分类和利用改良提出了依据。  相似文献   

Feeding ecology of dominant demersal fish species <Emphasis Type="Italic">Favonigobius gymnauchen,Repomucenus</Emphasis> spp. and <Emphasis Type="Italic">Tarphops oligolepis</Emphasis> at a sandy beach where larval Japanese flounder settle in the Seto Inland Sea,Japan     

Masayuki?YamamotoEmail author  Osamu?Tominaga 《Fisheries Science》2005,71(6):1332-1340

ABSTRACT:   Feeding habits of Favonigobius gymnauchen , Repomucenus spp. and Tarphops oligolepis were examined during the period from May to August in 1999, 2000 and 2001 at a sandy beach in the central Seto Inland Sea, Japan. The three species of fish accounted for more than 60% of all fish collected in terms of number of individuals. All three species mainly consumed small crustaceans. However, the major prey of F .  gymnauchen and Repomucenus spp. differed from that of T .  oligolepis . F .  gymnauchen and Repomucenus spp. mainly consumed mysids and small crangonid shrimp (<12 mm in body length), which predominated in the study area. T .  oligolepis actively selected only epifaunal mysids Nipponomysis ornata and avoided crangonid shrimp and gammarids . The frequencies of occurrence of fish in the guts of the three dominant species were very low, and larval and juvenile Japanese flounder were not observed in any of the three fish species. The diet of juvenile Japanese flounder was similar to that of the three species. From these results, it appears that these three fish are competing species for the flounder.  相似文献   

Daily rations and food availability of Japanese flounder Paralichthys olivaceus,small flounder Tarphops oligolepis and sand goby Favonigobius gymnauchen at a sandy beach in the central Seto Inland Sea,Japan     

Yamamoto  Masayuki  Tominaga  Osamu 《Fisheries Science》2007,73(2):314-323

ABSTRACT:     To estimate the daily rations of Paralichthys olivaceus , Tarphops oligolepis and Favonigobius gymnauchen and to clarify diel variation in food availability to them, diel sampling was conducted over a 24-h period at a sandy beach in the Seto Inland Sea, Japan. The mean total length and body weight (BW) of P. olivaceus , T. oligolepis and F. gymnauchen were 32.6 mm (0.35 g), 23.7 mm (0.13 g) and 50.2 mm (1.03 g), respectively. The mean stomach contents index and percentages of stomachs with food were high during the day but low at night, indicating that these species are day-feeders. Paralichthys olivaceus and F. gymnauchen consumed mainly mysids and crangonids, whereas T. oligolepis fed chiefly on mysids. The estimated mean daily rations (95% confidence intervals) for P. olivaceus , T. oligolepis and F. gymnauchen made with the bootstrap method were 18.1 (9.3–31.3)%BW, 13.2 (7.9–24.3)%BW and 3.7 (1.7–7.4)%BW, respectively. Mysids were more abundant in the near-bottom layer during the day than at night, but the opposite was true for crangonids.  相似文献   

Spatio‐temporal distribution of sea turtle strandings and factors contributing to their mortality in south‐eastern Brazil     

Alicia Bertoloto Tagliolatto  Daphne Wrobel Goldberg  Matthew H. Godfrey  Cassiano Monteiro‐Neto 《水产资源保护:海洋与淡水生态系统》2020,30(2):331-350

1. Data on stranded sea turtles were examined between 2010 and 2016 along the northern region of Rio de Janeiro state and between 2016 and 2017 in the southern region, looking for spatio‐temporal patterns and determining which factors contributed to their mortality.
2. A total of 12,162 strandings of all five species that occur in Brazil were recorded, with Chelonia mydas being the most common (89.9%). Sea turtles use the Rio de Janeiro coast as a feeding and/or migration area. The intense upwelling (October to April) may be an important factor for the sea turtles feeding in this region, mainly for Eretmochelys imbricata and Dermochelys coriacea, which had a higher number of strandings during this period.
3. Areas further north of the study area include an important nesting site for Caretta caretta in Brazil, which explains the higher concentration of strandings of subadults/adults of this species in this region and during its nesting season.
4. Many anthropogenic threats to sea turtles were documented, mainly incidental capture in fisheries and marine debris, indicating possible hotspots for these threats in the regions of Sepetiba and Guanabara Bays, Cabo Frio, and São Francisco de Itabapoana.
5. Among the natural causes of strandings, the primary factors were chronic illness, endoparasites, and fibropapillomatosis. However, pollution may also be an indirect threat, which negatively affects these animals through reduced health and immunosuppression, leaving them more susceptible to opportunistic diseases.
6. These data are valuable for directing and implementing specific and local mitigation measures along the Rio de Janeiro state coast, such as avoiding bycatch hotspots through fleet communication programmes and/or area and seasonal closures, enforceable legislation, effective penalties and proper waste management.

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金沙江河谷地区核桃沙滩育砧高效育苗技术试验     

杨根林  和善程  高云 《林业调查规划》2011,36(3):139-140,144

在丽江市金沙江河谷地区进行核桃沙滩育砧、移砧芽苗嫁接、大田育苗的研究.结果认为,该方法具有周期短,嫁接口愈合好,苗木生长健壮,根系发达,发苗整齐,砧木苗生长粗壮、种植后缓苗期短,成活率高等特点,而且成本低,无须搭建育砧苗床,能在短时间内培育出大量优质苗木.  相似文献   

洞庭湖滩地重金属分布及其生态风险评价   总被引：4，自引：0，他引：4  

李永进  汤玉喜  唐洁  吴敏 《中南林业科技大学学报(自然科学版)》2011,31(2)

采用内梅罗综合污染指数和Hakanson潜在生态危害指数法对洞庭湖退田还湖滩地土壤重金属分布特征、污染状况和潜在生态危害进行了评价。结果表明:与湖南省潮土背景值相比较,三个样地的中Pb、Cu、As的含量平均值都超过了背景值,Cd和Cr的含量平均值小于背景值,且Pb的平均含量均是湖南省潮土背景平均值的2倍多;广兴洲样地土壤中6种重金属的平均含量值均高于其他样地;集成垸土壤中的Pb、As和三个样地土壤中Cd重金属含量较易受外界环境因素的影响而波动较大。对重金属间及其与土壤理化性质进行相关性分析可知,Pb与pH有极显著的负相关性,6种金属元素与有机质存在正相关,Pb、Zn、As与全氮也存在一定的正相关,Pb与Zn以及Cu与Cd、Zn、As之间存在极显著的正相关性,Cd与Zn、As以及Cr与As之间存在显著的正相关性。由样地土壤中的重金属污染指数可知,广兴洲样地的土壤重金属污染指数和潜在生态危害系数均比其他样地高,但均属于轻微污染和存在轻微潜在生态危害。  相似文献   

长江滩地不同杨树无性系的生长比较          下载免费PDF全文

唐罗忠  吴麟  葛晓敏  田野  囤兴建  刘东  方升佐 《林业科学研究》2013,26(1):123-128

长江中下游地区有60多万公顷的滩地资源,主要包括长江滩地以及洞庭湖、鄱阳湖等湖滩地[1]。如何有效利用滩地资源,是摆在人们面前的重要问题。过去人们常常将滩地进行围垦或闲置,导致湿地功能的消退,并引发钉螺的蔓延和血吸虫病的危害。近30年来,许多人针对滩地资源特点,开展了  相似文献   

17种杂交狼尾草滩涂盐碱地生产性状评价     

杨智青  丁海荣  钟小仙  丁成龙  顾洪如 《家畜生态》2013,(9):61-64

为了探明狼尾草对江苏沿海滩涂盐碱地的适应性,测定了所引进的17种杂交狼尾草的株高、分蘖、直径、鲜草产量、茎叶比等5个性状.结果表明：17种杂交狼尾草品种之间差异较大,其中C11株高最高,与C4、C5、C10、C14等5品种间差异不显著（P＞0.05）;C1、C2、C3、C7、C9的平均分蘖数明显高于其余品种（P＜0.05）;17个品种杂交狼尾草的平均直径为1.37～2.26 cm,其中C10平均直径最大,与C2、C3、C6、C8、C11、C12、C14、C17差异不显著（P＞0.05）,C11和C12鲜草总产量最高,两者间差异显著（P＜0.05）,且与其余15个品种差异显著（P＜0.05）;C10、C11的茎叶比在1.4左右,两者间差异显著（P＜0.05）,且与其余15个品种差异显著（P＜0.05）.综上,C11、C12适宜在江苏沿海滩涂生产推广.  相似文献   

黄河下游滩地林鸡复合经营模式经济效益研究   总被引：2，自引：1，他引：1  

朱玉芳 《中国农学通报》2012,28(7):70-73

为更好利用和保护滩地生态系统,实现滩地区域生态安全与经济可持续发展。尝试将家禽养殖业和林业有机的结合起来,发展林禽复合产业。2006年在长垣县黄河滩地进行林鸡复合养殖,设置4个放养水平（每100 m2林地投放5只（散养）、9只（散养）、13只（散养）、30只（舍养））,结果表明：林地内1年可养三季鸡,鸡子系统的加入使系统资金流动加快,循环周期及投资回收期缩短,可在短期内见效益,比单纯种植杨树见效快。采用林下放养的方式,鸡的体质好肉品优、价格较高、收益较多。因此,应加强农林复合系统中的次级生产以获得较高经济效益。4个放养水平鸡子系统的经济产投比分别1.69、1.62、1.21、0.15,可见放养密度与产投比呈负相关。林鸡复合经营模式,为滩地的保护、开发利用提供一个新的思路。  相似文献