Improved soil moisture, nutrients, and economic benefits using plastic mulchs in balsa-based agroforestry systems

Area of Science:

• Agricultural Science
• Forestry
• Renewable Energy Materials

Background:

• Balsa wood is essential for wind turbine blade manufacturing.
• Exploring new cultivation regions is crucial for carbon neutrality goals.
• Xishuangbanna, China, presents a unique tropical climate suitable for balsa plantations.

Purpose of the Study:

• Investigate soil elements influencing balsa tree growth in Xishuangbanna.
• Assess the impact of cultivation practices on soil and economic outcomes.
• Determine the feasibility of large-scale balsa cultivation in the region.

Main Methods:

• Field study in Xishuangbanna, China.
• Analysis of soil elements (Mg, P, Al) and their effect on balsa growth.
• Evaluation of plastic film mulching effects on soil moisture, nitrate nitrogen, and economic benefits.

Main Results:

• Four-year-old balsa trees reached 5.8m height, with 27.7cm DBH increment and 196.0 m³ ha⁻¹ volume.
• Soil exchangeable magnesium and available phosphorus significantly promoted growth; aluminium inhibited it.
• Plastic film mulching improved soil moisture and nitrate nitrogen levels.
• Intercropping with coriander, ginger, or taro, combined with mulching, enhanced economic benefits.

Conclusions:

• Balsa trees can be successfully cultivated in Xishuangbanna, China.
• Optimizing soil magnesium and phosphorus content is critical for balsa growth.
• Plastic film mulching and intercropping practices improve soil conditions and economic viability.
• Successful Xishuangbanna cultivation supports China's wind power industry development.