Abstract

Soil reclamation through afforestation along with soil amendments is one of the most suitable practices to combat soil salinity while the use of biochar may have potential to ameliorate salt-affected soils. This study was designed to check effects of different biochars on the physico-chemical properties of soil and characteristics of three important agroforestry trees species: Eucalyptus camaldulensis, Vachellia nilotica and Dalbergia sissoo, in saline soils. Farmyard manure biochar (FYMB), sugarcane bagasse biochar (SCB), woodchips biochar (WCB) were applied (6% w/w) to check their effects on plants under saline conditions. Results revealed that FYMB was the best for promoting all growth and physiological parameters of three tree species while E. camaldulensis was the best suited species. Different types of biochars influenced the growth of agroforestry species differently as SCB showed better results for D. sissoo as compared to WCB but for V. nilotica and WCB was more effective than SCB. Trend of growth and other physiological attributes for E. camaldulensis and V. nilotica was FYMB > WCB > SCB > control whereas D. sissoo showed trend as FYMB > SCB > WCB > control. Biochar was helpful in improving physicochemical characteristics of saline soils by lowering values of soil EC and SAR but type of biochar has a differential effect on tree growth.

Novelty statement: Biochar may be a potential source for the amelioration of salt affected soils while less is known about the effects of different types of biochars on the soil and eco-physiological response of important agroforestry trees species in saline soils. In this study, although all types of biochar ameliorated the soil conditions and enhanced the plant growth, but farmyard manure biochar was the most efficient treatment among three types of used biochars.

摘要

通过植树造林和土壤改良剂进行土壤复垦是对抗土壤盐分最合适的做法之一，而生物炭的使用可能具有改善受盐分影响的土壤的潜力。本研究旨在检查不同生物炭对盐渍土壤中土壤理化性质和三种重要农林业树种的特性的影响：Eucalyptus camaldulensis、Vachellia nilotica 和 Dalbergia sissoo。施用农家肥生物炭 (FYMB)、甘蔗渣生物炭 (SCB)、木片生物炭 (WCB) (6% w/w) 以检查它们在盐水条件下对植物的影响。结果表明，FYMB对三种树种的所有生长和生理参数的促进作用最好，而E. camaldulensis是最适合的物种。不同类型的生物炭对农林业物种的生长有不同的影响，因为 SCB 对D. sissoo显示出比 WCB更好的结果，但对V. nilotica和 WCB 比 SCB 更有效。E. camaldulensis和V. nilotica的生长趋势和其他生理属性为FYMB > WCB > SCB > control，而D. sissoo 的趋势为 FYMB > SCB > WCB > control。生物炭通过降低土壤 EC 和 SAR 值有助于改善盐渍土壤的理化特性，但生物炭的类型对树木生长有不同的影响。

新颖性声明：生物炭可能是改善盐渍土壤的潜在来源，而对不同类型生物炭对盐渍土中重要农林业树种的土壤和生态生理反应的影响知之甚少。在本研究中，虽然所有类型的生物炭都改善了土壤条件并促进了植物生长，但农家肥生物炭是三种使用过的生物炭中最有效的处理方式。