Pinus roxburghii stand dynamics at a heavily impacted site in Nepal: Research through an educational fieldweek

Speer, James H.; Bräuning, Achim; Zhang, Qi-Bin; Pourtahmasi, Kambiz; Gaire, Narayan Prasad; Dawadi, Binod; Rana, Prabina; Dhakal, Yub Raj; Acharya, Ram Hari; Adhikari, Dhruba Lochan; Adhikari, Shankar; Aryal, Prakash Chandra; Bagale, Damodar; Baniya, Binod; Bhandari, Suman; Dahal, Navin; Dahal, Suchana; Ganbaatar, Narmandakh; Giri, Anjana; Gurung, Dhan B.; Khandu, Yeshey; Maharjan, Binu; Maharjan, Rajan; Malik, Rayees; Nath, Cheryl D.; Nepal, Bikash; Ngoma, Justine; Pant, Ramesh Raj; Pathak, Mitra Lal; Paudel, Hari Prasad; Sharma, Bimal Prasad; Hossain, Sarwar; Soronzonbold, Bayarbaatar; Swe, Thida; Thapa, Ichchha; Tiwari, Achyut

doi:10.1016/j.dendro.2016.01.005

Cited by 11 publications

(11 citation statements)

References 18 publications

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“…The sharp decline of BAI in times, and growth release afterward indicated that the growth is highly sensitive to human disturbance factors and resin extraction. The impact of forest disturbance in growth suppression was also indicated for P. roxburghii from similar climatic conditions in Kathmandu, Nepal (Speer et al 2017).…”

Section: Baimentioning

confidence: 83%

“…Most of these species are conifers, only a few studies are covered for broad-leaved trees like Alnus, Betula, Castanopsis, and Rhodondendron. Tree ring studies in Nepal Himalaya have been more restricted to the lower temperature zones including high mountain forest and subalpine treelines; however, some studies also have been carried out from subtropical region (Speer et al 2017, Sigdel et al 2018, Aryal et al 2018.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, chir pine was examined for its dendrochronological potential in only a few studies in Himalaya (Bhattacharya et al 1992, Brown et al 2011, Borgaonkar et al 1999. However, there have been a number of studies for this species covering both high and middle mountains of Nepal Himalaya (Bhuju and Gaire 2012, Shrestha et al 2014, Speer et al 2017, Sigdel et al 2018, Aryal et al 2019. Although P. roxburghii is also one of the most important tree species for the local people for its multipurpose uses such as timber, resins, firewood, the growth climate relationship, and forest stand health in panted forest are unknown in Nepal.…”

Section: Introductionmentioning

confidence: 99%

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Growth performance of planted population of Pinus roxburghii in central Nepal

et al. 2020

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Background Climate change has altered the various ecosystem processes including forest ecosystem in Himalayan region. Although the high mountain natural forests including treelines in the Himalayan region are mainly reported to be temperature sensitive, the temperature-related water stress in an important growth-limiting factor for middle elevation mountains. And there are very few evidences on growth performance of planted forest in changing climate in the Himalayan region. A dendrochronological study was carried out to verify and record the impact of warming temperature tree growth by using the tree cores of Pinus roxburghii from Batase village of Dhulikhel in Central Nepal with sub-tropical climatic zone. For this total, 29 tree cores from 25 trees of P. roxburghii were measured and analyzed. Result A 44-year long tree ring width chronology was constructed from the cores. The result showed that the radial growth of P. roxburghii was positively correlated with pre-monsoon (April) rainfall, although the correlation was not significant and negatively correlated with summer rainfall. The strongest negative correlation was found between radial growth and rainfall of June followed by the rainfall of January. Also, the radial growth showed significant positive correlation with that previous year August mean temperature and maximum temperature, and significant negative correlation between radial growth and maximum temperature (Tmax) of May and of spring season (March-May), indicating moisture as the key factor for radial growth. Despite the overall positive trend in the basal area increment (BAI), we have found the abrupt decline between 1995 and 2005 AD. Conclusion The results indicated that chir pine planted population was moisture sensitive, and the negative impact of higher temperature during early growth season (March-May) was clearly seen on the radial growth. We emphasize that the forest would experience further moisture stress if the trend of warming temperatures continues. The unusual decreasing BAI trend might be associated with forest management processes including resin collection and other disturbances. Our results showed that the planted pine forest stand is sub-healthy due to major human intervention at times. Further exploration of growth climate response from different climatic zones and management regimes is important to improve our understanding on the growth performance of mid-hill pine forests in Nepal.

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Section: Baimentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Growth performance of planted population of Pinus roxburghii in central Nepal

et al. 2020

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“…Several studies are employing differing methodologies to determine the age of standing trees and subsequent interrelationships. Some of these are ring count by destructive sampling techniques [9], coring by Pressler's borer [10,11], and using radiometric scanner [12] or Tomography [13,14]. If the forest is dominated by Pinus, the approximate age of the stands can be found by counting the whorls of branches [1].…”

Section: Introductionmentioning

confidence: 99%

Tapering, Tree Rings and Biomass Production of <em>Pinus</em> <em>roxburghii</em> (Sarg.): A Dendrochronological Study

Pandey¹,

Pokhrel²

2020

Preprint

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Distinguishable annual growth rings produce in Pinus roxburghii are an asset to find out the age of individual tree. This paper aimed to determine the age of P. roxburghii through coring samples and test the relationship with forest production. The biomass estimated, girths measured at two different sections and heights measured which allowed to determine the rate of tapering of the stand. The regression analysis was performed to test the relationship between various variables. The mean age of the P. roxburghii stand was found to be 23.97 (~24 years). The result showed the significant (p<0.05) positive correlation coefficient has been seen between age with girth at breast height, biomass, volume and carbon stock. However, no significant (p>0.05) correlation (r = 0.08) was found between age and height of the stand. In contrast, a correlation between diameter at breast height (DBH) was significant (p<0.05) and positive with volume, biomass, but no significant (p>0.05) correlation (r = 0.14) found between DBH and height of the stand. However, height has a significant (p<0.05) positive correlation with biomass. The mean biomass was 375 kg and mean annual increment (MAI) was 15 kg per tree. Rate of tapering of the studied stand predicted to be 3 cm diameter decreased with trunk height running at 100 cm from base to upward of P. roxburghii stand and vice versa. Result suggests that height-age relation is very weak whereas age, DBH, biomass and carbon has a significant correlation signifies that time-based forests' production and potential production estimation can be obtained in a relatively accurate way by utilizing the age of stand. The time-based forest production analysis is pioneer work in Nepal. The study affirms the tree ring count in P. roxburghii would be a credible and accurate method to determine the age of standing trees.

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“…Dendrochronological study was carried out to determine the impact of climate change on growth of P. wallichiana (Bajwa et al, 2015). Similar work was conducted on P. roxburghii to understand stand age, structure, soil erosion, disturbance history and tree health (Speer et al, 2016). Composition, population structure and diversity of P. wallichiana in Garhwal Himalaya with special reference to altitude and aspect was studied by Bhandari (2003).…”

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confidence: 99%

Variation in structure and composition of two pine forests in Kailash Sacred Landscape, Nepal

Subedi

Gurung

Ghimire

et al. 2018

Banko

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Chir pine (Pinus roxburghii Sarg.) and blue pine (Pinus wallichiana A.B. Jacks.) are two common species found in mid-hill forests of Nepal where households largely depend on forest resources for their livelihoods and subsistence. The management of such forests is supported by our understanding of the dynamics in forest structure and species composition and the relationship between different forest community characteristics. This study was designed to determine the variation in species composition and the relationship between various forest community characteristics in two pine forests of Kailash Sacred Landscape, Nepal. Quadrat sampling was applied to collect information on forest species, forest community structure, and disturbance factors.Data was statistically analyzed using IBM SPSS. There were a total of 31 plant species under 28 genera and 20 families in the P. roxburghii forest, and 38 plant species under 37 genera and 19 families in the P. wallichiana forest. Mean DBH, height and canopy diameter of P. roxburghii was 23.98 cm, 12.77 m and 1.97 m, respectively, and that of P. wallichiana was 31.5 cm, 11.48 m and 2.79 m, respectively. The relationship between DBH and both height and crown diameter showed strong relationships in the two forest types. In both forests, DBH and height class distribution showed a hump-shaped (unimodal type) distribution with a greater proportion of medium-sized individuals that indicated disruptive forest regeneration. Fire and tree cut were significant disturbance factors in P. roxburghii forest, while grazing and trampling were significant in P. wallichiana forest. The extent of these disturbance factors as determinants of regeneration and species recruitment is important to assess for effective forest management. Banko JanakariA Journal of Forestry Information for NepalVol. 28, No. 1, 2018, page: 26-36

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Pinus roxburghii stand dynamics at a heavily impacted site in Nepal: Research through an educational fieldweek

Cited by 11 publications

References 18 publications

Growth performance of planted population of Pinus roxburghii in central Nepal

Growth performance of planted population of Pinus roxburghii in central Nepal

Tapering, Tree Rings and Biomass Production of <em>Pinus</em> <em>roxburghii</em> (Sarg.): A Dendrochronological Study

Variation in structure and composition of two pine forests in Kailash Sacred Landscape, Nepal

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