Results 21 to 30 of about 8,361 (128)

リンチ カカク ホウソク ニカンスル キソテキ ケンキュウ (ダイ2ホウ) [PDF]

open access: yes, 1970
まえがき 本研究は,林地価格法則に関する基礎的原理の解明を目的とし,第1報にひき続き東北地方におけるその後の実証的分析の結果をまとめたものである.第1報においては,林地移動の動向と特質,山元立木価格の変動と特質をふまえつつ,林地価格の形成される機構について解明したが,今回は林地価格形成の他の要因の1つである林道についてその投資効果と林地価格への影響に関し実態をもとに分析し検討をおこなった.林道は育林とともに林業の生産基盤を形成する意義をもち,林業生産性引き上げの契機となるので ...
福岡 克也
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Five Frontiers for Science and Practice of Ecosystem Restoration in East African Forest Landscapes 东非森林景观生态系统恢复的科学与实践:五大前沿

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 534-545, December 2025.
Implementing ecosystem restoration remains challenging for policymakers and practitioners. Focusing on Rwanda, we used a participatory world‐café approach involving scientists, practitioners, and decision‐makers working on ecosystem restoration to identify emerging challenges and future research priority areas. We identified five critical frontiers for
Dula W. Duguma   +33 more
wiley   +1 more source

古尔班通古特沙漠人工林土壤水分及其影响因素 [PDF]

open access: yes, 2009
通过2004年2~12月对古尔班通古特沙漠南缘2年生人工梭梭和沙拐枣混交林内3条典型坡面土壤水分进行了系统监测与研究。结果表明:人工林土壤水分状况受季节性降水、人工林种植密度、地形因子的影响而出现明显的时空分异。在空间上将土壤水分变化划分为三层,0~30cm为活跃层,30~60 cm为次活跃层,60~120 cm为相对稳定层。通过主成分分析,得出地形因子、种植密度对0~30 cm土层土壤水分的影响次序为坡度>坡向>种植密度>高程,30~60 cm土层为坡向>种植密度>坡度>高程,60~120 ...
付恒飞, 宋春武, 蒋进, 陈钧杰
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Nutritional and Physiological Markers Are Mediated by Seasonality and Forest Access in Captive Coquerel's Sifakas 圈养科氏冕狐猴 (Coquerel's Sifakas) 的营养和生理指标受季节性和森林通道的影响

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 652-664, December 2025.
We profiled nutritional and physiological markers in captive sifakas, endangered primates from Madagascar, managed in expansive, non‐native forest enclosures. Variation in many markers reflects freely foraged diets and the energy required to maintain homeostasis under more naturalistic conditions.
Lydia K. Greene   +5 more
wiley   +1 more source

东北林蛙人工养殖存在问题及发展对策

open access: yes野生动物学报, 2009
分析了人工养殖东北林蛙存在的一些问题,阐述了人工养殖东北林蛙的发展对策。认为人工养殖东北林蛙应该以半人工养殖方式为主。如何解决技术难题是东北林蛙全人工养殖发展的首要问题。目前,东北林蛙全人工养殖技术还不成熟,不适宜推广普及。
田秀华   +3 more
doaj  

晋西黄土区典型林地土壤水分变化特征

open access: yesShuitu Baochi Xuebao, 2021
选择晋西黄土区蔡家川流域5种典型林地(山杨×辽东栎天然次生林、人工油松×刺槐混交林、人工油松林、人工刺槐林、人工侧柏林)作为研究对象,在每块样地中心布设1个土壤水分观测点,采用TRIME-TDR土壤水分测定仪定位观测2016—2018年1—12月的土壤体积含水量,测定深度为200 cm,每20 cm为1个测层,每月分上、中、下旬进行土壤水分含量观测,分析不同林地类型土壤水分年内变化规律和土壤水分垂直变化规律。结果表明:(1)研究区不同林地土壤水分年内变化可以划分为稳定期(1—3月)、波动期(4—6月 ...
赵丹阳   +7 more
doaj  

Genetic Confirmations of Dwarf Lemurs Across Madagascar Highlights Complex Biogeographic Patterns 马达加斯加全境鼠狐猴的遗传确认揭示了复杂的生物地理模式

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 665-674, December 2025.
Using a diagnostic mitochondrial marker gene, we document the presence of furry‐eared dwarf lemurs, a species known from Madagascar's eastern montane rainforests, in several forest fragments across the island's central highlands. These findings raise new questions about when this species colonized these sites, how they tolerate these changing and ...
Marina B. Blanco   +27 more
wiley   +1 more source

Distribution patterns of stream macroinvertebrates at Kamitani, Ashiu Forest Research Station, Kyoto, Japan [PDF]

open access: yes, 2012
2008-2009年の芦生研究林上谷流域における11河川 (針広混交林10, スギ人工林1)の底生動物群集構造を報告し, 群集構造と森林環境との関係を考察した. その結果, 底生動物群集は (1)シカ食害・排除区の2次谷河川, (2)シカ食害区の1次谷河川, (3)シカ排除区の1次谷河川, (4)シカ食害区のスギ人工林1次谷河川の4 種類に類型化された. シカ食害区の1次谷河川の群集はスギ人工林1 次谷河川を除く他河川より多様度が低く, 細粒土砂に生息する底生動物に特徴づけられた.
加藤, 真, 境, 優, 夏原, 由博
core  

Integrating Plant Tissue Culture and DNA Barcoding: Cutting‐Edge Technologies for Plant Conservation in Sri Lanka 整合植物组织培养与dna条形码技术:斯里兰卡植物保护的前沿技术

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 555-568, December 2025.
Sri Lanka's biodiversity is threatened by habitat loss, climate change, and ineffective traditional conservation methods. Integrating plant tissue culture and DNA barcoding offers scalable, precise tools for conserving rare and endemic species. This review emphasizes the potential of biotechnological approaches to enhance conservation accuracy and ...
Mylange Dona Kasundi Mekhala Gunasena   +2 more
wiley   +1 more source

The mechanism of soil degradation in unmanaged Japanese cypress plantations [PDF]

open access: yes, 2010
Thesis (Ph. D. in Science)--University of Tsukuba, (A), no.
Wakiyama Yoshifumi
core  

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