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Influence of Nepalese alder on soil physico-chemical properties and fine root dynamics in white oak forests in the central Himalaya, India
Catena ( IF 6.2 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.catena.2020.105140
Rajendra Kr. Joshi , Satish Chandra Garkoti

The main objective of the study was to investigate influence of Nepalese alder (Alnus nepalensis D. Don) on fine root biomass (diameter ≤ 2 mm) dynamics and the physical and chemical properties of the soil in white oak (Quercus leucotrichophora A. Camus) forests. Five representative stands of each oak mixed alder (OMA) and oak without alder (OWA) were selected along the stand development gradient in the Indian central Himalaya. Fine root and soil samples from of 0–10 cm, 10–20 cm, and 20–30 cm depths were collected using soil core method. Soil physical and chemical properties and monthly variations in fine root dynamics (biomass distribution and decomposition) were analyzed. Fine root decomposition was studied by using the litterbag technique. Redundancy and correlation analyses were performed to evaluate the relationship between fine root dynamics, stands, and tree total basal area and soil properties. Both the fine root biomass and production of Q. leucotrichophora were significantly (P < 0.05) higher for oak without alder stands than oak mixed alder stands. Fine root biomass, production, and turnover rate of A. nepalensis were significantly (P < 0.05) higher than Q. leucotrichophora in oak mixed alder stands. Within the investigated soil profile, in all the sites, maximum fine root biomass and production were found in the upper (0–10 cm) soil depths. The analyses revealed clear differences in all the measured soil physical and chemical properties and fine root traits in oak mixed alder and oak without alder stands. The soil organic carbon (SOC), total nitrogen (TN) contents, and soil C and N stocks were significantly (P < 0.05) higher in oak mixed alder stands than oak without alder stands while opposite trends were found for soil pH and bulk density (BD). Present findings reveal that improvement of the soil properties under oak mixed alder stands was significantly higher than the oak without alder stands. Fine root decomposition for A. nepalensis was significantly faster than Q. leucotrichophora. Q. leucotrichophora fine roots in OMA stands decomposed at significantly faster rates compared to OWA stands. Additionally, the present study suggests that variation, in fine root dynamics across the forest stands was not only positively correlated to the soil physical and chemical properties but also highly dependent on the forest stand characteristics.



中文翻译:

尼泊尔al木对印度喜马拉雅山中部白橡树林土壤理化性质和细根动态的影响

该研究的主要目的是研究尼泊尔der木(Alnus nepalensis D. Don)对白橡(Quercus leucotrichophora)细根生物量(直径≤2 mm)动力学和土壤理化特性的影响。A.加缪)森林。沿印度中部喜马拉雅山的林分发展梯度,分别选择了每棵橡树混合al木(OMA)和无橡树橡木(OWA)的五个代表性林分。使用土壤核心方法收集了0–10 cm,10–20 cm和20–30 cm深度的细根和土壤样品。分析了土壤的理化性质和细根动态(生物量分布和分解)的每月变化。使用垃圾袋技术研究了细根分解。进行了冗余和相关分析,以评估细根动态,林分,树木总基础面积与土壤特性之间的关系。细根白蚁的优良根生物量和产量无al木的橡木比混oak木的橡木显着更高(P <0.05)。尼泊尔曲霉的细根生物量,产量和周转率均显着高于白斑蚁(P <0.05)在橡木混合mixed木看台上。在所调查的土壤剖面内,在所有地点,在较高的土壤深度(0-10厘米)中都发现了最大的细根生物量和产量。分析表明,在所有混合的der木和无al木的栎木中,所有测得的土壤理化性质和细根性状均存在明显差异。橡树混合al木的土壤有机碳(SOC),总氮(TN)含量以及土壤碳和氮含量显着(P <0.05)高于无oak木的橡树,而土壤pH和堆积密度却呈现相反的趋势(BD)。目前的发现表明,橡木混合al木林下土壤性质的改善显着高于无al木林下的橡木。尼泊尔细根的细根分解明显快于Q.leucotrichophora。与OWA林分相比,OMA林分中的Q. leucotrichophora细根分解速度明显加快。此外,本研究表明,整个林分的细根动态变化不仅与土壤理化性质正相关,而且还高度依赖于林分特征。

更新日期:2021-01-13
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