LY/T 1897-2022Code of management technology for plantation of Larix principis-rupprechtii Mayr. (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting:

This document replaces LY/T 1897-2010 "Technical Regulations for Larix Plantation Forest Management in North China": Compared with LY/T 1897-2010, except Apart from editorial changes, the main technical changes are as follows:

--- Deleted the normative references "GB/T 15783" and "GB/T 18337.3" (see Chapter 2 of the:2010 edition);

--- Added normative references "GB/T 8822.10" and "LY/T 1690-2017" (see Chapter 2);

---Deleted the term "forest management, public welfare forest, high-quality wood, medium wood, inferior wood and auxiliary wood" and its definition (see the:2010 edition - Chapter 3), the term "target diameter" and its definition are added (see Chapter 3);

--- Added general requirements (see Chapter 4), changed the age classification (see 4.2, 9:1 of the:2010 edition);

---No distinction between public welfare forests and timber forests (see Chapter 6, Chapter 8 and Chapter 9, 5:1, 7:1 and 9:1 of the:2010 edition);

--- Changed the technical requirements for low-quality and low-efficiency forest improvement (see 10.2, 10:1 and 10:2 of the:2010 edition);

--- Added "business supervision and effectiveness evaluation" and changed the corresponding content (see Chapter 12, Chapter 12 of the:2010 edition):

Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents:

1 Scope

This document stipulates the division of cultivation area and site quality of North China larch (Larixprincipis-rupprechtiiMayr:) Seedlings and seedlings, afforestation, young forest management and protection, forest tending, low-quality and low-efficiency forest transformation, pest control, management supervision and effectiveness evaluation, etc:

Require:

This document is applicable to the larch cultivation areas in North my country, including the western remnants of Daxingan Mountains, Yanshan Mountains, Taihang Mountains, Luliang Mountains, Yinshan Mountains, and Helan Mountains:

Mountains, Liupan Mountains, Qinling Mountains and Qilian Mountains in whole or in part:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the documents: where dated references for documents, only the version corresponding to the date applies to this document; for undated reference documents, the latest version (including all amendments) applies in this document:

GB 6000 Quality classification of seedlings of main afforestation species GB 7908 Forest tree seed quality classification GB/T 8822.10 China forest tree seed area North China larch seed area GB/T 15776-2016 Afforestation Technical Regulations GB/T 15781-2015 Forest tending regulations LY/T 1000 container seedling cultivation technology LY/T 1646 Forest Harvesting Operation Regulations LY/T 1690-2017 Technical regulations for low-efficiency forest improvement

3 Terms and Definitions

GB 7908, GB/T 8822.10, GB/T 15776-2016, GB/T 15781-2015, LY/T 1646 and LY/T 1690-2017 and the following terms and definitions apply to this document:

target diameter According to site conditions, age, combined with management objectives, the diameter at breast height for tree cultivation determined:

4 General requirements

4.1 Cultivation area and site quality division

4.1.1 Cultivation area division According to the physical and geographical conditions, water and heat conditions and growth differences of North China larch in different introduction areas in my country, its cultivation areas are divided into See Appendix A for the division and characteristics of the main cultivation areas of North China larch in the four regions: