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Proceedings of the International Academy of Ecology and Environmental Sciences, 2020, 10(3): 86-96
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Article

Effect of primary soil nutrients (NPK) on forests' biomass production and SOC density of Nepalese forests

Hari Prasad Pandey1, Shila Pokhrel2, Pooja Pandey3, Narayan Prasad Pokhrel1, Ganesh Paudel4
1Ministry of Forests and Environment, Government of Nepal, Singha Durbar, Kathmandu, Nepal
2Division Forest Office, Arghakhanchi district, Ministry of Industry, Tourism, Forests and Environment, Province No. 5, Nepal
3Central Department of Botany, Tribhuvan University, Kirtipur, Kathmandu, Nepal
4Ministry of Industry, Tourism, Forests and Environment, Gandaki Province, Nepal

Received 15 May 2020;Accepted 20 June 2020;Published 1 September 2020
IAEES

Abstract
Soil nutrients in the forests ecosystem play crucial roles in performing key ecological functions. This research was carried out to quantify biomass and SOC, and to see the responses of primary soil nutrients (NPK) and other soil properties on biomass and SOC density in the forests. Three community forests (CFs) from Dadeldhura district of Far Western Province of Nepal were taken as a study area. Simple random sampling with concentric circular plots of various sizes was laid for necessary data collection. Altogether 45 plots were measured. All the parameters were estimated and analyzed using standardized procedures. Generalized Linear Model (GLM) was fitted and respective tests were performed base on data characteristics. A relatively medium quantity of biomass density, SOC and NPK were found and these differed significantly between forests. The result showed the SOC, N and bulk density influenced significantly but inversely to biomass density. However, K, P and pH did not respond significantly on biomass density. Similarly, phosphorous responded significantly and positively on SOC but bulk density and pH showed significantly but the inverse effect on SOC. Results indicate that soil pH, P and K hardly influence forests' biomass. The higher the SOC does not necessarily produce higher biomass in the forest as SOC, N, and bulk density responds inversely to biomass density. Likewise, biomass density, N and K rarely affect the SOC in forests. This result will be a reference to policy and practical implications at forestry. Because of the wide variability of soils characteristics, similar research to generalize the results is recommended.

Keywords biomass density;community forests (CFs);Western Nepal;primary soil nutrients (NPK);SOC density.


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